Move git config/remote to gitrepo package and add global lock to resolve possible conflict when updating repository git config file (#35151)

Partially fix #32018 

`git config` and `git remote` write operations create a temporary file
named `config.lock`. Since these operations are not atomic, they must
not be run in parallel. If two requests attempt to modify the same
repository concurrently—such as during a compare operation—one may fail
due to the presence of an existing `config.lock` file.

In cases where `config.lock` is left behind due to an unexpected program
exit, a global lock mechanism could allow us to safely remove the stale
lock file when a related error is detected. While this behavior is not
yet implemented in this PR, it is planned for a future enhancement.

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/doctor/misc.go

@@ -91,18 +91,12 @@ func checkEnablePushOptions(ctx context.Context, logger log.Logger, autofix bool
 
 	if err := iterateRepositories(ctx, func(repo *repo_model.Repository) error {
 		numRepos++
-		r, err := gitrepo.OpenRepository(ctx, repo)
-		if err != nil {
-			return err
-		}
-		defer r.Close()
 
 		if autofix {
-			_, _, err := git.NewCommand("config", "receive.advertisePushOptions", "true").RunStdString(ctx, &git.RunOpts{Dir: r.Path})
-			return err
+			return gitrepo.GitConfigSet(ctx, repo, "receive.advertisePushOptions", "true")
 		}
 
-		value, _, err := git.NewCommand("config", "receive.advertisePushOptions").RunStdString(ctx, &git.RunOpts{Dir: r.Path})
+		value, err := gitrepo.GitConfigGet(ctx, repo, "receive.advertisePushOptions")
 		if err != nil {
 			return err
 		}