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/pull/pull.go

@@ -141,7 +141,7 @@ func NewPullRequest(ctx context.Context, opts *NewPullRequestOptions) error {
 			return err
 		}
 
-		compareInfo, err := baseGitRepo.GetCompareInfo(pr.BaseRepo.RepoPath(),
+		compareInfo, err := GetCompareInfo(ctx, pr.BaseRepo, pr.BaseRepo, baseGitRepo,
 			git.BranchPrefix+pr.BaseBranch, pr.GetGitHeadRefName(), false, false)
 		if err != nil {
 			return err
@@ -1074,7 +1074,7 @@ func GetPullCommits(ctx context.Context, baseGitRepo *git.Repository, doer *user
 	if pull.HasMerged {
 		baseBranch = pull.MergeBase
 	}
-	prInfo, err := baseGitRepo.GetCompareInfo(pull.BaseRepo.RepoPath(), baseBranch, pull.GetGitHeadRefName(), true, false)
+	prInfo, err := GetCompareInfo(ctx, pull.BaseRepo, pull.BaseRepo, baseGitRepo, baseBranch, pull.GetGitHeadRefName(), true, false)
 	if err != nil {
 		return nil, "", err
 	}