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)

services/repository/files/patch_test.go

@@ -21,7 +21,7 @@ func TestGitPatchPrepare(t *testing.T) {
 	user2 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
 	repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
 
-	gitRepo, err := git.OpenRepository(repo1.CodeStorageRepo())
+	gitRepo, err := git.OpenRepository(t.Context(), repo1.CodeStorageRepo())
 	require.NoError(t, err)
 	defer gitRepo.Close()
 

services/repository/files/temp_repo.go

@@ -76,7 +76,7 @@ func (t *TemporaryUploadRepository) Clone(ctx context.Context, branch string, ba
 		}
 		return fmt.Errorf("temp repo clone error: %w, %s", err, stderr)
 	}
-	gitRepo, err := git.OpenRepositoryLocal(t.basePath)
+	gitRepo, err := git.OpenRepositoryLocal(ctx, t.basePath)
 	if err != nil {
 		return err
 	}
@@ -89,7 +89,7 @@ func (t *TemporaryUploadRepository) Init(ctx context.Context, objectFormatName s
 	if err := git.InitRepositoryLocal(ctx, t.basePath, false, objectFormatName); err != nil {
 		return err
 	}
-	gitRepo, err := git.OpenRepositoryLocal(t.basePath)
+	gitRepo, err := git.OpenRepositoryLocal(ctx, t.basePath)
 	if err != nil {
 		return err
 	}