Merge branch '34640-fix-epic-search-dropdown' into 'master'

Force network search instead of cached search in Epics dropdown

Closes #34640

See merge request gitlab-org/gitlab!29033

ee/app/assets/javascripts/vue_shared/components/sidebar/epics_select/base.vue

@@ -101,7 +101,7 @@ export default {
      */
     searchQuery(value) {
       if (value) {
-        if (!this.groupEpics.length) this.fetchEpics(this.searchQuery);
+        this.fetchEpics(this.searchQuery);
       } else {
         this.fetchEpics();
       }

ee/spec/frontend/vue_shared/components/sidebar/epics_select/base_spec.js

@@ -82,7 +82,6 @@ describe('EpicsSelect', () => {
         });
 
         it('should call action `fetchEpics` with `searchQuery` when value is set and `groupEpics` is empty', () => {
-          wrapper.vm.$store.dispatch('receiveEpicsSuccess', []);
           wrapper.vm.$store.dispatch('setSearchQuery', 'foo');
 
           return wrapper.vm.$nextTick(() => {