Delete ee_switch files from merge request widget

(cherry picked from commit 9c64af3c2821d4f63e4a48903f4d3099bb85cebd)

app/assets/javascripts/vue_merge_request_widget/ee_switch_mr_widget_options.js

-import MRWidgetOptions from './mr_widget_options.vue';
-
-export default MRWidgetOptions;

app/assets/javascripts/vue_merge_request_widget/services/ee_switch_mr_widget_service.js

-import MRWidgetService from './mr_widget_service';
-
-export default MRWidgetService;

app/assets/javascripts/vue_merge_request_widget/stores/ee_switch_get_state_key.js

-import getStateKey from './get_state_key';
-
-export default getStateKey;

app/assets/javascripts/vue_merge_request_widget/stores/ee_switch_mr_widget_store.js

-import MergeRequestStore from './mr_widget_store';
-
-export default MergeRequestStore;

app/assets/javascripts/vue_merge_request_widget/stores/ee_switch_state_maps.js

-import stateMaps from './state_maps';
-
-export default stateMaps;