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/migrations/dump.go

@@ -642,7 +642,7 @@ func (g *RepositoryDumper) Finish() error {
 
 // DumpRepository dump repository according MigrateOptions to a local directory
 func DumpRepository(ctx context.Context, baseDir, ownerName string, opts base.MigrateOptions) error {
-	doer, err := user_model.GetAdminUser()
+	doer, err := user_model.GetAdminUser(ctx)
 	if err != nil {
 		return err
 	}
@@ -705,7 +705,7 @@ func updateOptionsUnits(opts *base.MigrateOptions, units []string) error {
 
 // RestoreRepository restore a repository from the disk directory
 func RestoreRepository(ctx context.Context, baseDir, ownerName, repoName string, units []string, validation bool) error {
-	doer, err := user_model.GetAdminUser()
+	doer, err := user_model.GetAdminUser(ctx)
 	if err != nil {
 		return err
 	}