gpui: Prevent the same action name from being registered multiple times (#33359)

Also removes duplicate `editor::RevertFile` and `vim::HelixDelete`
actions

Release Notes:

- N/A
90c893747cMichael Sloan committed on 6/26/2025, 6:24:14 AM· committed by GitHubparentd09c7eb
4 files changedLine totals unavailable