Move db related basic functions to models/db (#17075)

* Move db related basic functions to models/db

* Fix lint

* Fix lint

* Fix test

* Fix lint

* Fix lint

* revert unnecessary change

* Fix test

* Fix wrong replace string

* Use *Context

* Correct committer spelling and fix wrong replaced words

Co-authored-by: zeripath <art27@cantab.net>

modules/repository/main_test.go

@@ -8,9 +8,9 @@ import (
 	"path/filepath"
 	"testing"
 
-	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/models/db"
 )
 
 func TestMain(m *testing.M) {
-	models.MainTest(m, filepath.Join("..", ".."))
+	db.MainTest(m, filepath.Join("..", ".."))
 }