Move SignedInUser to user service and RoleType and Roles to org (#53445)

* Move SignedInUser to user service and RoleType and Roles to org

* Use go naming convention for roles

* Fix some imports and leftovers

* Fix ldap debug test

* Fix lint

* Fix lint 2

* Fix lint 3

* Fix type and not needed conversion

* Clean up messages in api tests

* Clean up api tests 2

pkg/tests/api/alerting/api_available_channel_test.go

@@ -9,8 +9,8 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/services/ngalert/notifier/channels_config"
+	"github.com/grafana/grafana/pkg/services/org"
 	"github.com/grafana/grafana/pkg/services/user"
 	"github.com/grafana/grafana/pkg/tests/testinfra"
 )
@@ -27,7 +27,7 @@ func TestAvailableChannels(t *testing.T) {
 
 	// Create a user to make authenticated requests
 	createUser(t, store, user.CreateUserCommand{
-		DefaultOrgRole: string(models.ROLE_EDITOR),
+		DefaultOrgRole: string(org.RoleEditor),
 		Password:       "password",
 		Login:          "grafana",
 	})