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>

tests/integration/rename_branch_test.go

@@ -7,13 +7,19 @@ import (
 	"net/http"
 	"testing"
 
+	git_model "code.gitea.io/gitea/models/git"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/tests"
 
 	"github.com/stretchr/testify/assert"
 )
 
 func TestRenameBranch(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	unittest.AssertExistsAndLoadBean(t, &git_model.Branch{RepoID: 1, Name: "master"})
+
 	// get branch setting page
 	session := loginUser(t, "user2")
 	req := NewRequest(t, "GET", "/user2/repo1/settings/branches")