Git on main thread (#26573)

This moves spawning of the git subprocess to the main thread. We're not
yet
sure why, but when we spawn a process using GCD's background queues,
sub-processes like git-credential-manager fail to open windows.

This seems to be fixable either by using the main thread, or by using a
standard background thread,
but for now we use the main thread.


Release Notes:

- Git: Fix git-credential-manager

---------

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Kirill Bulatov <mail4score@gmail.com>

crates/git_ui/src/git_panel.rs

@@ -1501,15 +1501,17 @@ impl GitPanel {
         telemetry::event!("Git Uncommitted");
 
         let confirmation = self.check_for_pushed_commits(window, cx);
-        let prior_head = self.load_commit_details("HEAD", cx);
+        let prior_head = self.load_commit_details("HEAD".to_string(), cx);
 
         let task = cx.spawn_in(window, |this, mut cx| async move {
             let result = maybe!(async {
                 if let Ok(true) = confirmation.await {
                     let prior_head = prior_head.await?;
 
-                    repo.update(&mut cx, |repo, cx| repo.reset("HEAD^", ResetMode::Soft, cx))?
-                        .await??;
+                    repo.update(&mut cx, |repo, cx| {
+                        repo.reset("HEAD^".to_string(), ResetMode::Soft, cx)
+                    })?
+                    .await??;
 
                     Ok(Some(prior_head))
                 } else {
@@ -3401,7 +3403,7 @@ impl GitPanel {
 
     fn load_commit_details(
         &self,
-        sha: &str,
+        sha: String,
         cx: &mut Context<Self>,
     ) -> Task<anyhow::Result<CommitDetails>> {
         let Some(repo) = self.active_repository.clone() else {
@@ -3911,7 +3913,7 @@ impl GitPanelMessageTooltip {
             cx.spawn_in(window, |this, mut cx| async move {
                 let details = git_panel
                     .update(&mut cx, |git_panel, cx| {
-                        git_panel.load_commit_details(&sha, cx)
+                        git_panel.load_commit_details(sha.to_string(), cx)
                     })?
                     .await?;