Use page heading component in feature flags list view

What does this MR do and why?

Use page heading component on feature flags page

Screenshots or screen recordings

Before After
Screenshot_2025-01-10_at_9.46.05_AM Screenshot_2025-01-10_at_9.44.01_AM

How to set up and validate locally

http://127.0.0.1:3000/gitlab-org/gitlab-test/-/feature_flags

Links

Edited by Annabel Dunstone Gray

Merge request reports

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