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/convert/convert.go

@@ -50,7 +50,7 @@ func ToEmailSearch(email *user_model.SearchEmailResult) *api.Email {
 }
 
 // ToBranch convert a git.Commit and git.Branch to an api.Branch
-func ToBranch(ctx context.Context, repo *repo_model.Repository, b *git.Branch, c *git.Commit, bp *git_model.ProtectedBranch, user *user_model.User, isRepoAdmin bool) (*api.Branch, error) {
+func ToBranch(ctx context.Context, repo *repo_model.Repository, branchName string, c *git.Commit, bp *git_model.ProtectedBranch, user *user_model.User, isRepoAdmin bool) (*api.Branch, error) {
 	if bp == nil {
 		var hasPerm bool
 		var canPush bool
@@ -65,11 +65,11 @@ func ToBranch(ctx context.Context, repo *repo_model.Repository, b *git.Branch, c
 			if err != nil {
 				return nil, err
 			}
-			canPush = issues_model.CanMaintainerWriteToBranch(perms, b.Name, user)
+			canPush = issues_model.CanMaintainerWriteToBranch(perms, branchName, user)
 		}
 
 		return &api.Branch{
-			Name:                b.Name,
+			Name:                branchName,
 			Commit:              ToPayloadCommit(ctx, repo, c),
 			Protected:           false,
 			RequiredApprovals:   0,
@@ -81,7 +81,7 @@ func ToBranch(ctx context.Context, repo *repo_model.Repository, b *git.Branch, c
 	}
 
 	branch := &api.Branch{
-		Name:                b.Name,
+		Name:                branchName,
 		Commit:              ToPayloadCommit(ctx, repo, c),
 		Protected:           true,
 		RequiredApprovals:   bp.RequiredApprovals,