Fix Karma disconnect, restore ee_mr_widget_options_spec
We started to experienced persistent karma failures on EE. https://gitlab.com/gitlab-org/gitlab-ee/issues/10592
It is suspected to be a resource issue, potentially relating to the memory required to load all of the tests available in EE.
The best solution for repairing master was to remove a large EE spec (ee/spec/javascripts/vue_mr_widget/ee_mr_widget_options_spec.js
) whilst we figure out the potential memory issue. https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/10368
The spec is ~850 lines so we are now missing some coverage and we should restore this spec ASAP.
Furthermore, even though we are switching to Jest, whilst we don't understand the problem we cannot ensure that Karma wont reach this state again before we've made a full migration to Jest.