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>

services/repository/files/patch.go

@@ -58,7 +58,7 @@ func (opts *ApplyDiffPatchOptions) Validate(ctx context.Context, repo *repo_mode
 	if opts.NewBranch != opts.OldBranch {
 		existingBranch, err := gitRepo.GetBranch(opts.NewBranch)
 		if existingBranch != nil {
-			return models.ErrBranchAlreadyExists{
+			return git_model.ErrBranchAlreadyExists{
 				BranchName: opts.NewBranch,
 			}
 		}

services/repository/files/update.go

@@ -197,7 +197,7 @@ func ChangeRepoFiles(ctx context.Context, repo *repo_model.Repository, doer *use
 	if opts.NewBranch != opts.OldBranch {
 		existingBranch, err := gitRepo.GetBranch(opts.NewBranch)
 		if existingBranch != nil {
-			return nil, models.ErrBranchAlreadyExists{
+			return nil, git_model.ErrBranchAlreadyExists{
 				BranchName: opts.NewBranch,
 			}
 		}