Add cis sanity tests

[xoxys]

How to categorize this PR?

/kind test

What this PR does / why we need it:

Integrate csi-sanity tests.

Special notes for your reviewer:

$ ginkgo --focus="CSI sanity test" ./pkg/csi/blockstorage/
[...]
Ran 70 of 150 Specs in 1.124 seconds
SUCCESS! -- 70 Passed | 0 Failed | 1 Pending | 79 Skipped
PASS

Ginkgo ran 1 suite in 17.520745416s
Test Suite Passed

$ make test
./hack/test.sh ./cmd/... ./pkg/...
> Unit Tests
?   	github.com/stackitcloud/cloud-provider-stackit/cmd/cloud-controller-manager	[no test files]
?   	github.com/stackitcloud/cloud-provider-stackit/cmd/stackit-csi-plugin	[no test files]
ok  	github.com/stackitcloud/cloud-provider-stackit/pkg/ccm	1.640s
ok  	github.com/stackitcloud/cloud-provider-stackit/pkg/cmp	1.335s
?   	github.com/stackitcloud/cloud-provider-stackit/pkg/csi	[no test files]
ok  	github.com/stackitcloud/cloud-provider-stackit/pkg/csi/blockstorage	2.151s
ok  	github.com/stackitcloud/cloud-provider-stackit/pkg/csi/util	0.762s
?   	github.com/stackitcloud/cloud-provider-stackit/pkg/csi/util/blockdevice	[no test files]
?   	github.com/stackitcloud/cloud-provider-stackit/pkg/csi/util/mount	[no test files]
ok  	github.com/stackitcloud/cloud-provider-stackit/pkg/labels	0.574s
ok  	github.com/stackitcloud/cloud-provider-stackit/pkg/metrics	1.150s
?   	github.com/stackitcloud/cloud-provider-stackit/pkg/mock/iaas	[no test files]
?   	github.com/stackitcloud/cloud-provider-stackit/pkg/mock/loadbalancer	[no test files]
ok  	github.com/stackitcloud/cloud-provider-stackit/pkg/stackit	1.924s
ok  	github.com/stackitcloud/cloud-provider-stackit/pkg/stackit/errors	2.098s
?   	github.com/stackitcloud/cloud-provider-stackit/pkg/stackit/metadata	[no test files]
?   	github.com/stackitcloud/cloud-provider-stackit/pkg/version	[no test files]

Breaking changes:

[ske-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign mstueer for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[xoxys]

/retest

[ske-prow]

@xoxys: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cloud-provider-stackit-verify	02c3a38	link	true	/test pull-cloud-provider-stackit-verify

Full PR test history. Your PR dashboard. Command help for this repository.
Please help us cut down on flakes by linking this test failure to an open flake report or filing a new flake report if you can't find an existing one. Also see the gardener testing guideline for how to avoid and hunt flakes.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.

[ske-prow]

PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.