feat: Search improvements for conversations (#6645)

* feat: Shows search as a popover

* Reverts search from popover to page

* Fixes review comments on usability

* Fixes keyboard navigation issues

app/javascript/dashboard/store/modules/conversationSearch.js

@@ -55,6 +55,9 @@ export const actions = {
       commit(types.FULL_SEARCH_SET_UI_FLAG, { isFetching: false });
     }
   },
+  async clearSearchResults({ commit }) {
+    commit(types.FULL_SEARCH_SET, {});
+  },
 };
 
 export const mutations = {