chore: still keep ctx in git.Repository struct for cat-file batch command (#38684)

Unfortunately, we can't completely remove the ctx from git.Repository,
because the CatFileBatch still heavily depends on a parent context.

If we remove the Repository ctx, the CatFileBatch will become a mess and
create a lot of unnecessary git processes.

http://localhost:3000/-/admin/monitor/perftrace

* Before: open a repo home, dozens of git processes (duplicate cat-file)
* After: only a few (no duplicate cat-file)

modules/git/catfile_batch_reader.go

@@ -52,7 +52,7 @@ func newCatFileBatch(ctx context.Context, repo RepositoryFacade, cmdCatFile *git
 		stdPipeClose()
 	}))
 
-	err := cmdCatFile.WithRepo(repo).StartWithStderr(ctx)
+	err := cmdCatFile.WithParentCallerInfo().WithRepo(repo).StartWithStderr(ctx)
 	if err != nil {
 		log.Error("Unable to start git command %v: %v", cmdCatFile.LogString(), err)
 		// ideally here it should return the error, but it would require refactoring all callers