Rename "Prompt Library" to "Rules Library" (#29349)

There's probably more to do to fully make the transition, and we'll
still debate a bit internally whether this is the name, but just opening
this PR up now for visibility.

Release Notes:

- N/A
87f85f1863Danilo Leal committed on 4/24/2025, 7:42:06 PM· committed by GitHubparent1a4dab9
17 files changedLine totals unavailable