Avoid holding worktree lock for a long time while updating large repos' git status (#12266)

Fixes https://github.com/zed-industries/zed/issues/9575
Fixes https://github.com/zed-industries/zed/issues/4294

### Problem

When a large git repository's `.git` folder changes (due to a `git
commit`, `git reset` etc), Zed needs to recompute the git status for
every file in that git repository. Part of computing the git status is
the *unstaged* part - the comparison between the content of the file and
the version in the git index. In a large git repository like `chromium`
or `linux`, this is inherently pretty slow.

Previously, we performed this git status all at once, and held a lock on
our `BackgroundScanner`'s state for the entire time. On my laptop, in
the `linux` repo, this would often take around 13 seconds.

When opening a file, Zed always refreshes the metadata for that file in
its in-memory snapshot of worktree. This is normally very fast, but if
another task is holding a lock on the `BackgroundScanner`, it blocks.

###  Solution

I've restructured how Zed handles Git statuses, so that when a git
repository is updated, we recompute files' git statuses in fixed-sized
batches. In between these batches, the `BackgroundScanner` is free to
perform other work, so that file operations coming from the main thread
will still be responsive.

Release Notes:

- Fixed a bug that caused long delays in opening files right after
performing a commit in very large git repositories.

crates/project/src/project.rs

@@ -11014,7 +11014,7 @@ async fn search_ignored_entry(
                 }
             } else if !fs_metadata.is_symlink {
                 if !query.file_matches(Some(&ignored_abs_path))
-                    || snapshot.is_path_excluded(ignored_entry.path.to_path_buf())
+                    || snapshot.is_path_excluded(&ignored_entry.path)
                 {
                     continue;
                 }