clean up duplicated user creation code (#50178)

* clean up duplicated user creation code

* remove unused duplicate getOrCreateOrg function

* fix up tests

pkg/services/sqlstore/sqlstore.go

@@ -177,12 +177,12 @@ func (ss *SQLStore) ensureMainOrgAndAdminUser() error {
 		// ensure admin user
 		if !ss.Cfg.DisableInitAdminCreation {
 			ss.log.Debug("Creating default admin user")
-			if _, err := ss.createUser(ctx, sess, userCreationArgs{
+			if _, err := ss.createUser(ctx, sess, models.CreateUserCommand{
 				Login:    ss.Cfg.AdminUser,
 				Email:    ss.Cfg.AdminUser + "@localhost",
 				Password: ss.Cfg.AdminPassword,
 				IsAdmin:  true,
-			}, false); err != nil {
+			}); err != nil {
 				return fmt.Errorf("failed to create admin user: %s", err)
 			}