Allow users to search Settings within a page
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## Problem to solve
GitLab is highly configurable and offers numerous settings across Admin, Group, Project, and User views. Finding the right setting can be difficult, even when the user knows generally where to look.
## Proposal
One of the proposed solutions outlined in the overall [Settings Prioritization epic](https://gitlab.com/groups/gitlab-org/-/epics/4410) was to introduce the ability to search from within the settings views.
Limited [searching of settings](https://gitlab.com/gitlab-org/gitlab/-/issues/241317) was added to the global navigation in %"13.6" but this is a separate, more targeted solution.
The scope of this effort is to provide inline search of a single view in Settings. Searching across pages is something we're interested in and exploring in https://gitlab.com/gitlab-org/gitlab/-/issues/292947
Matches to the search term should be highlighted and un-matched sections are filtered out from the view. For pages with collapsed sections, searching for a setting within that section will automatically expand it and highlight the search term.
Replaces https://gitlab.com/gitlab-org/gitlab/-/issues/23635
epic