Sync branches into databases (#22743)

Related #14180
Related #25233 
Related #22639
Close #19786
Related #12763 

This PR will change all the branches retrieve method from reading git
data to read database to reduce git read operations.

- [x] Sync git branches information into database when push git data
- [x] Create a new table `Branch`, merge some columns of `DeletedBranch`
into `Branch` table and drop the table `DeletedBranch`.
- [x] Read `Branch` table when visit `code` -> `branch` page
- [x] Read `Branch` table when list branch names in `code` page dropdown
- [x] Read `Branch` table when list git ref compare page
- [x] Provide a button in admin page to manually sync all branches.
- [x] Sync branches if repository is not empty but database branches are
empty when visiting pages with branches list
- [x] Use `commit_time desc` as the default FindBranch order by to keep
consistent as before and deleted branches will be always at the end.

---------

Co-authored-by: Jason Song <i@wolfogre.com>

modules/repository/repo.go

@@ -151,6 +151,10 @@ func MigrateRepositoryGitData(ctx context.Context, u *user_model.User,
 			}
 		}
 
+		if _, err := SyncRepoBranchesWithRepo(ctx, repo, gitRepo, u.ID); err != nil {
+			return repo, fmt.Errorf("SyncRepoBranchesWithRepo: %v", err)
+		}
+
 		if !opts.Releases {
 			// note: this will greatly improve release (tag) sync
 			// for pull-mirrors with many tags
@@ -169,7 +173,7 @@ func MigrateRepositoryGitData(ctx context.Context, u *user_model.User,
 		}
 	}
 
-	ctx, committer, err := db.TxContext(db.DefaultContext)
+	ctx, committer, err := db.TxContext(ctx)
 	if err != nil {
 		return nil, err
 	}