Cleanup allow_protected_branches_for_group feature flag

Emma Parkrequested to merge
497049/cleanup-feature-flag into master

What does this MR do and why?

Related to:[Feature flag] Cleanup allow_protected_branches... (#497049 - closed)

This MR removes the allow_protected_branches_for_group feature flag from the codebase. The feature has been enabled by default in production for an appropriate amount of time, and we are now confident in its stability.

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