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/pull/temp_repo.go

@@ -11,7 +11,7 @@ import (
 	"path/filepath"
 	"strings"
 
-	"code.gitea.io/gitea/models"
+	git_model "code.gitea.io/gitea/models/git"
 	issues_model "code.gitea.io/gitea/models/issues"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/modules/git"
@@ -181,7 +181,7 @@ func createTemporaryRepoForPR(ctx context.Context, pr *issues_model.PullRequest)
 		Run(prCtx.RunOpts()); err != nil {
 		cancel()
 		if !git.IsBranchExist(ctx, pr.HeadRepo.RepoPath(), pr.HeadBranch) {
-			return nil, nil, models.ErrBranchDoesNotExist{
+			return nil, nil, git_model.ErrBranchNotExist{
 				BranchName: pr.HeadBranch,
 			}
 		}