Revert "git: Intercept signing prompt from GPG when committing" (#34306)

Reverts zed-industries/zed#34096

This introduced a regression, because the unlocked key can't benefit
from caching.

Release Notes:
- N/A

crates/fs/src/fake_git_repo.rs

@@ -375,10 +375,8 @@ impl GitRepository for FakeGitRepository {
         _message: gpui::SharedString,
         _name_and_email: Option<(gpui::SharedString, gpui::SharedString)>,
         _options: CommitOptions,
-        _ask_pass: AskPassDelegate,
         _env: Arc<HashMap<String, String>>,
-        _cx: AsyncApp,
-    ) -> BoxFuture<'static, Result<()>> {
+    ) -> BoxFuture<'_, Result<()>> {
         unimplemented!()
     }