Add `editor::RevertSelectedHunks` to revert git diff hunks in the editor (#9068)

https://github.com/zed-industries/zed/assets/2690773/653b5658-e3f3-4aee-9a9d-0f2153b4141b

Release Notes:

- Added `editor::RevertSelectedHunks` (`cmd-alt-z` by default) for
reverting git hunks from the editor
347178039cKirill Bulatov committed on 3/8/2024, 11:37:24 PM· committed by GitHubparent6a7a3b2
13 files changedLine totals unavailable