Add feature flag for fix_pipeline on an MR with a failing pipeline

Fred de Gierrequested to merge
562189-create-button-to-trigger-fix_pipeline-on-an-mr-with-a-failing-pipeline-2 into master

What does this MR do and why?

This MR adds the feature flag for controlling behavior of showing a Duo Agent action button in the frontend.

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Before After

How to set up and validate locally

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Related to #562189 (closed)

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