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/services/user/userimpl/user.go

@@ -141,7 +141,7 @@ func (s *Service) Create(ctx context.Context, cmd *user.CreateUserCommand) (*use
 		orgUser := org.OrgUser{
 			OrgID:   orgID,
 			UserID:  usr.ID,
-			Role:    org.ROLE_ADMIN,
+			Role:    org.RoleAdmin,
 			Created: time.Now(),
 			Updated: time.Now(),
 		}