Chore: use org service methods (#55768)

* Chore: use org service methods

* fix tests

* fix errors

* adjust func signatures for getbyname

* 💩

* Use the same fake service to get the user in AC and in HS

* Fix middleware test

* Fix more middleware test

* Fix api tests

Co-authored-by: gamab <gabi.mabs@gmail.com>
Co-authored-by: Ida Furjesova <ida.furjesova@grafana.com>

pkg/middleware/testing.go

@@ -12,6 +12,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/auth"
 	"github.com/grafana/grafana/pkg/services/contexthandler"
 	"github.com/grafana/grafana/pkg/services/login/loginservice"
+	"github.com/grafana/grafana/pkg/services/org/orgtest"
 	"github.com/grafana/grafana/pkg/services/sqlstore"
 	"github.com/grafana/grafana/pkg/services/sqlstore/mockstore"
 	"github.com/grafana/grafana/pkg/services/user/usertest"
@@ -43,6 +44,7 @@ type scenarioContext struct {
 	loginService         *loginservice.LoginServiceMock
 	apiKeyService        *apikeytest.Service
 	userService          *usertest.FakeUserService
+	orgService           *orgtest.FakeOrgService
 
 	req *http.Request
 }