respect can_override_approvers in create and update services

app/services/merge_requests/create_service.rb

@@ -9,6 +9,12 @@ module MergeRequests
 
       params[:target_project_id] ||= source_project.id
 
+      unless @project.can_override_approvers?
+        params.delete(:approvals_before_merge)
+        params.delete(:approver_ids)
+        params.delete(:approver_group_ids)
+      end
+
       merge_request = MergeRequest.new
       merge_request.source_project = source_project
       merge_request.source_branch = params[:source_branch]

app/services/merge_requests/update_service.rb

@@ -17,6 +17,12 @@ module MergeRequests
         merge_request.merge_params['force_remove_source_branch'] = params.delete(:force_remove_source_branch)
       end
 
+      unless project.can_override_approvers?
+        params.delete(:approvals_before_merge)
+        params.delete(:approver_ids)
+        params.delete(:approver_group_ids)
+      end
+
       old_approvers = merge_request.overall_approvers.to_a
 
       handle_wip_event(merge_request)