more context for models (#19511)

make more usage of context, to have more db transaction in one session

(make diff of  #9307 smaller)

models/branches_test.go

@@ -7,6 +7,7 @@ package models
 import (
 	"testing"
 
+	"code.gitea.io/gitea/models/db"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unittest"
 
@@ -99,11 +100,14 @@ func TestRenameBranch(t *testing.T) {
 	repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1}).(*repo_model.Repository)
 	_isDefault := false
 
-	err := UpdateProtectBranch(repo1, &ProtectedBranch{
+	ctx, committer, err := db.TxContext()
+	defer committer.Close()
+	assert.NoError(t, err)
+	assert.NoError(t, UpdateProtectBranch(ctx, repo1, &ProtectedBranch{
 		RepoID:     repo1.ID,
 		BranchName: "master",
-	}, WhitelistOptions{})
-	assert.NoError(t, err)
+	}, WhitelistOptions{}))
+	assert.NoError(t, committer.Commit())
 
 	assert.NoError(t, RenameBranch(repo1, "master", "main", func(isDefault bool) error {
 		_isDefault = isDefault