Move login related structs and functions to models/login (#17093)

* Move login related structs and functions to models/login

* Fix test

* Fix lint

* Fix lint

* Fix lint of windows

* Fix lint

* Fix test

* Fix test

* Only load necessary fixtures when preparing unit tests envs

* Fix lint

* Fix test

* Fix test

* Fix error log

* Fix error log

* Fix error log

* remove unnecessary change

* fix error log

* merge main branch

services/auth/sspi_windows.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 
 	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/models/login"
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
@@ -152,7 +153,7 @@ func (s *SSPI) Verify(req *http.Request, w http.ResponseWriter, store DataStore,
 
 // getConfig retrieves the SSPI configuration from login sources
 func (s *SSPI) getConfig() (*sspi.Source, error) {
-	sources, err := models.ActiveLoginSources(models.LoginSSPI)
+	sources, err := login.ActiveSources(login.SSPI)
 	if err != nil {
 		return nil, err
 	}
@@ -248,7 +249,7 @@ func sanitizeUsername(username string, cfg *sspi.Source) string {
 // fails (or if negotiation should continue), which would prevent other authentication methods
 // to execute at all.
 func specialInit() {
-	if models.IsSSPIEnabled() {
+	if login.IsSSPIEnabled() {
 		Register(&SSPI{})
 	}
 }