Add feature flag sanity test job
What does this MR do?
Adds a job to run the feature flag sanity test added in gitlab-org/gitlab!87978 (merged)
Test results
Using https://gitlab.com/gitlab-org/quality/nightly/-/merge_requests/116
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✅ https://gitlab.com/gitlab-org/quality/nightly/-/jobs/2572234011 -
✅ https://gitlab.com/gitlab-org/quality/nightly/-/jobs/2572234012
Check-list
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Verify the change in all affected pipelines.
Edited by Mark Lapierre