perf: use git cat-file -e instead of git rev-list in _rev_exists

Replace git rev-list --quiet with git cat-file -e for checking if a
revision exists. This changes the operation from O(commits) to O(1).

Benchmarks from a large monorepo:
- git rev-list --quiet <sha>: 5150ms
- git cat-file -e <sha>: 4ms

Both commands have the same semantics: return success if the revision
exists in the local repo, failure otherwise.

pre_commit/commands/hook_impl.py

@@ -111,7 +111,7 @@ def _ns(
 
 
 def _rev_exists(rev: str) -> bool:
-    return not subprocess.call(('git', 'rev-list', '--quiet', rev))
+    return subprocess.call(('git', 'cat-file', '-e', rev)) == 0
 
 
 def _pre_push_ns(