Follow-up to #61185, which moved hook execution from Zed into `git
commit` itself. There was previously no way to skip hooks from the UI;
#59846 and #56318 attempted to add one on top of the old behavior. This
PR adds support on top of the new implementation.

Adds a “Skip Hooks” toggle to the commit menus in the Git panel and
commit modal, with a corresponding command-palette action. When enabled,
the next commit runs with `git commit --no-verify`, skipping pre-commit
and commit-msg hooks. The toggle clears after a successful commit or
when switching repositories, but remains enabled when a commit fails so
it can be retried.

Release Notes:

- Added a “Skip Hooks” commit option that skips pre-commit and
commit-msg hooks.