feat(integrations): Data Forwarding Endpoint to retrieve/create org-level configs

[jasonyuezhang]

Retrieve/Create functionality for org level configs. "GET" requires read and gets all the configs for that org (including project overrides). "POST" requires write and adds a new data forwarding config

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Copied from getsentry#101047
Original PR: getsentry#101047

[propel-test-bot]

Add Organization-Level Data Forwarding API Endpoints

This PR introduces new API endpoints for managing organization-level data forwarding configurations in Sentry. It provides functionality to retrieve all data forwarding configs for an organization (including any project overrides) via a GET request, and to create new data forwarding configurations via a POST request. The endpoints require appropriate scopes (org:read for GET and org:write for POST), and integrate full input validation, permission checks, and audit logging. The change also includes comprehensive test coverage and registers the new endpoint in the main API router.

Key Changes

• Added DataForwardingIndexEndpoint in src/sentry/integrations/api/endpoints/data_forwarding_index.py enabling GET and POST for organization-level data forwarders.
• GET lists all data forwarders for the organization, supports pagination, and requires org:read scope.
• POST creates new data forwarding configs, runs input validation, permission checks, and requires org:write scope.
• Audit log entry is generated for successful creation (POST).
• Integrated OpenAPI schema (drf_spectacular), caching policies, and region silo decorators.
• Registered endpoint route and name in src/sentry/api/urls.py as /organizations/<org>/forwarding/.
• Added extensive tests in tests/sentry/integrations/api/endpoints/test_data_forwarding.py covering success/error/permissions and all supported provider types.

Affected Areas

• src/sentry/integrations/api/endpoints/data_forwarding_index.py
• src/sentry/api/urls.py
• tests/sentry/integrations/api/endpoints/test_data_forwarding.py

This summary was automatically generated by @propel-code-bot