IntegrationSink: OIDC test

[matzew]

Fixes #

Proposed Changes

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew

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• test/OWNERS [matzew]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.44%. Comparing base (4fd274a) to head (3d508cf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8524   +/-   ##
=======================================
  Coverage   52.44%   52.44%           
=======================================
  Files         397      397           
  Lines       24869    24869           
=======================================
  Hits        13042    13042           
  Misses      11041    11041           
  Partials      786      786           

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[knative-prow]

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

Test name	Commit	Details	Required	Rerun command
build-tests_eventing_main	a9d1afc	link	true	/test build-tests
unit-tests_eventing_main	a9d1afc	link	true	/test unit-tests
reconciler-tests_eventing_main	a9d1afc	link	true	/test reconciler-tests

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