clean up merge request widget UI

...s/vue_merge_request_widget/components/mr_widget_author.js

...e_merge_request_widget/components/mr_widget_deployment.js

...s/vue_merge_request_widget/components/mr_widget_header.js

...merge_request_widget/components/mr_widget_memory_usage.js

...e_merge_request_widget/components/mr_widget_merge_help.js

...vue_merge_request_widget/components/mr_widget_pipeline.js

...erge_request_widget/components/mr_widget_related_links.js

..._merge_request_widget/components/mr_widget_status_icon.js

...ge_request_widget/components/states/mr_widget_archived.js

...t_widget/components/states/mr_widget_auto_merge_failed.js

...ge_request_widget/components/states/mr_widget_checking.js

...erge_request_widget/components/states/mr_widget_closed.js

...e_request_widget/components/states/mr_widget_conflicts.js

...est_widget/components/states/mr_widget_failed_to_merge.js

...erge_request_widget/components/states/mr_widget_locked.js

...mponents/states/mr_widget_merge_when_pipeline_succeeds.js

...erge_request_widget/components/states/mr_widget_merged.js

...uest_widget/components/states/mr_widget_missing_branch.js

...request_widget/components/states/mr_widget_not_allowed.js

...st_widget/components/states/mr_widget_nothing_to_merge.js