Acceptance tests for secrets validator

[alessandro-Doyensec]

This PR adds acceptance validator tests.

After the addition of acceptance tests these plugin failed the test:

• github.com/google/osv-scalibr/veles/secrets/awsaccesskey | An errResp.Error.Code was missing and the validator returned veles.ValidationFailed instead of veles.ValidationInvalid
• github.com/google/osv-scalibr/veles/secrets/cloudflareapitoken | The service returns http.StatusBadRequest on malformed token
• github.com/google/osv-scalibr/veles/secrets/cratesioapitoken | The service returns http.StatusBadRequest on malformed token
• github.com/google/osv-scalibr/veles/secrets/grokxaiapikey | InvalidResponseCodes were not specified leading to false positives, needs further investigation
• github.com/google/osv-scalibr/veles/secrets/salesforceoauth2access | The service returns 403 for bad ouauth token, needs further investigation
• github.com/google/osv-scalibr/veles/secrets/salesforceoauth2client | The service is not testable online
• github.com/google/osv-scalibr/veles/secrets/salesforceoauth2refresh | The request was poorly formatted and resulted in the validator always failing
• github.com/google/osv-scalibr/veles/secrets/gcshmackey | The request creation was always failing because the host header was missing. I confirmed that the validator is now properly working.

Test output

➜  osv-scalibr git:(acceptance-tests-for-secrets-detector) ✗ ONLINE=1 go test \
github.com/google/osv-scalibr/veles/secrets/awsaccesskey \
github.com/google/osv-scalibr/veles/secrets/cloudflareapitoken \
github.com/google/osv-scalibr/veles/secrets/cratesioapitoken \
github.com/google/osv-scalibr/veles/secrets/grokxaiapikey \
github.com/google/osv-scalibr/veles/secrets/salesforceoauth2access \
github.com/google/osv-scalibr/veles/secrets/salesforceoauth2client \
github.com/google/osv-scalibr/veles/secrets/salesforceoauth2refresh \
-run 'TestAccept.*Validator' -v
=== RUN   TestAcceptValidator
=== RUN   TestAcceptValidator/cancelled-ctx
=== RUN   TestAcceptValidator/unreachable-service
=== RUN   TestAcceptValidator/true-negatives
StatusCode: 403 Forbidden
Response: <ErrorResponse xmlns="https://sts.amazonaws.com/doc/2011-06-15/">
  <Error>
    <Type>Sender</Type>
    <Code>InvalidClientTokenId</Code>
    <Message>The security token included in the request is invalid.</Message>
  </Error>
  <RequestId>e1de87b3-d8e9-4fec-873c-280dbd3bc366</RequestId>
</ErrorResponse>

    accept_validator.go:170: Validate() with true-negative secret returned status VALIDATION_FAILED, want VALIDATION_INVALID
    accept_validator.go:173: Validate() with true-negative secret returned unexpected error: unknown error code: "InvalidClientTokenId"
--- FAIL: TestAcceptValidator (0.47s)
    --- PASS: TestAcceptValidator/cancelled-ctx (0.00s)
    --- PASS: TestAcceptValidator/unreachable-service (0.00s)
    --- FAIL: TestAcceptValidator/true-negatives (0.47s)
FAIL
FAIL	github.com/google/osv-scalibr/veles/secrets/awsaccesskey	1.049s
=== RUN   TestAcceptValidator
=== RUN   TestAcceptValidator/cancelled-ctx
=== RUN   TestAcceptValidator/unreachable-service
=== RUN   TestAcceptValidator/true-negatives
StatusCode: 400 Bad Request
Response: {"success":false,"errors":[{"code":6003,"message":"Invalid request headers","error_chain":[{"code":6111,"message":"Invalid format for Authorization header"}]}],"messages":[],"result":null}
    accept_validator.go:170: Validate() with true-negative secret returned status VALIDATION_FAILED, want VALIDATION_INVALID
    accept_validator.go:173: Validate() with true-negative secret returned unexpected error: https://api.cloudflare.com/client/v4/zones: unexpected HTTP status 400
--- FAIL: TestAcceptValidator (0.30s)
    --- PASS: TestAcceptValidator/cancelled-ctx (0.00s)
    --- PASS: TestAcceptValidator/unreachable-service (0.00s)
    --- FAIL: TestAcceptValidator/true-negatives (0.30s)
FAIL
FAIL	github.com/google/osv-scalibr/veles/secrets/cloudflareapitoken	0.514s
=== RUN   TestAcceptValidator
=== RUN   TestAcceptValidator/cancelled-ctx
=== RUN   TestAcceptValidator/unreachable-service
=== RUN   TestAcceptValidator/true-negatives
StatusCode: 401 Unauthorized
Response: {"errors":[{"detail":"The given API token does not match the format used by crates.io. Tokens generated before 2020-07-14 were generated with an insecure random number generator, and have been revoked. You can generate a new token at https://crates.io/me. For more information please see https://blog.rust-lang.org/2020/07/14/crates-io-security-advisory.html. We apologize for any inconvenience."}]}
    accept_validator.go:170: Validate() with true-negative secret returned status VALIDATION_FAILED, want VALIDATION_INVALID
    accept_validator.go:173: Validate() with true-negative secret returned unexpected error: https://crates.io/api/v1/crates/osvscalibr361aa9c83e8d69e1/owners: unexpected HTTP status 401
--- FAIL: TestAcceptValidator (0.60s)
    --- PASS: TestAcceptValidator/cancelled-ctx (0.00s)
    --- PASS: TestAcceptValidator/unreachable-service (0.00s)
    --- FAIL: TestAcceptValidator/true-negatives (0.60s)
FAIL
FAIL	github.com/google/osv-scalibr/veles/secrets/cratesioapitoken	0.991s
=== RUN   TestAcceptAPIValidator
=== RUN   TestAcceptAPIValidator/cancelled-ctx
=== RUN   TestAcceptAPIValidator/unreachable-service
=== RUN   TestAcceptAPIValidator/true-negatives
StatusCode: 400 Bad Request
Response: {"code":"Client specified an invalid argument","error":"Incorrect API key provided: gr***00. You can obtain an API key from https://console.x.ai."}
    accept_validator.go:170: Validate() with true-negative secret returned status VALIDATION_VALID, want VALIDATION_INVALID
--- FAIL: TestAcceptAPIValidator (0.19s)
    --- PASS: TestAcceptAPIValidator/cancelled-ctx (0.00s)
    --- PASS: TestAcceptAPIValidator/unreachable-service (0.00s)
    --- FAIL: TestAcceptAPIValidator/true-negatives (0.19s)
=== RUN   TestAcceptManagementAPIValidator
=== RUN   TestAcceptManagementAPIValidator/cancelled-ctx
=== RUN   TestAcceptManagementAPIValidator/unreachable-service
=== RUN   TestAcceptManagementAPIValidator/true-negatives
StatusCode: 401 Unauthorized
Response: {"code":16, "message":"Invalid bearer token. Please ensure you use a valid management key.", "details":[]}
--- PASS: TestAcceptManagementAPIValidator (0.41s)
    --- PASS: TestAcceptManagementAPIValidator/cancelled-ctx (0.00s)
    --- PASS: TestAcceptManagementAPIValidator/unreachable-service (0.00s)
    --- PASS: TestAcceptManagementAPIValidator/true-negatives (0.41s)
FAIL
FAIL	github.com/google/osv-scalibr/veles/secrets/grokxaiapikey	1.343s
=== RUN   TestAcceptValidator
=== RUN   TestAcceptValidator/cancelled-ctx
=== RUN   TestAcceptValidator/unreachable-service
=== RUN   TestAcceptValidator/true-negatives
StatusCode: 403 Forbidden
Response: Bad_OAuth_Token
    accept_validator.go:170: Validate() with true-negative secret returned status VALIDATION_FAILED, want VALIDATION_INVALID
    accept_validator.go:173: Validate() with true-negative secret returned unexpected error: https://login.salesforce.com/services/oauth2/userinfo: unexpected HTTP status 403
--- FAIL: TestAcceptValidator (0.17s)
    --- PASS: TestAcceptValidator/cancelled-ctx (0.00s)
    --- PASS: TestAcceptValidator/unreachable-service (0.00s)
    --- FAIL: TestAcceptValidator/true-negatives (0.17s)
FAIL
FAIL	github.com/google/osv-scalibr/veles/secrets/salesforceoauth2access	1.282s
=== RUN   TestAcceptValidator
=== RUN   TestAcceptValidator/cancelled-ctx
=== RUN   TestAcceptValidator/unreachable-service
=== RUN   TestAcceptValidator/true-negatives
    accept_validator.go:170: Validate() with true-negative secret returned status VALIDATION_FAILED, want VALIDATION_INVALID
    accept_validator.go:173: Validate() with true-negative secret returned unexpected error: https://yuvrajapp.my.salesforce.com/services/oauth2/token: HTTP request failed: Post "https://yuvrajapp.my.salesforce.com/services/oauth2/token": dial tcp: lookup yuvrajapp.my.salesforce.com: no such host
--- FAIL: TestAcceptValidator (1.05s)
    --- PASS: TestAcceptValidator/cancelled-ctx (0.00s)
    --- PASS: TestAcceptValidator/unreachable-service (0.00s)
    --- FAIL: TestAcceptValidator/true-negatives (1.05s)
FAIL
FAIL	github.com/google/osv-scalibr/veles/secrets/salesforceoauth2client	2.333s
=== RUN   TestAcceptValidator
=== RUN   TestAcceptValidator/cancelled-ctx
=== RUN   TestAcceptValidator/unreachable-service
=== RUN   TestAcceptValidator/true-negatives
StatusCode: 400 Bad Request
Response: {"error":"unsupported_grant_type","error_description":"grant type not supported"}
    accept_validator.go:170: Validate() with true-negative secret returned status VALIDATION_FAILED, want VALIDATION_INVALID
    accept_validator.go:173: Validate() with true-negative secret returned unexpected error: https://login.salesforce.com/services/oauth2/token: unexpected HTTP status 400
--- FAIL: TestAcceptValidator (0.18s)
    --- PASS: TestAcceptValidator/cancelled-ctx (0.00s)
    --- PASS: TestAcceptValidator/unreachable-service (0.00s)
    --- FAIL: TestAcceptValidator/true-negatives (0.18s)
FAIL
FAIL	github.com/google/osv-scalibr/veles/secrets/salesforceoauth2refresh	1.112s
FAIL