feat: Add a view for mentions (#3505)

- Added a new table mentions for saving user mentions
- Added a filter conversation_type in the API
- Added a view to see the mentions

app/javascript/dashboard/components/widgets/conversation/specs/MoreActions.spec.js

@@ -5,7 +5,7 @@ import VTooltip from 'v-tooltip';
 
 import Button from 'dashboard/components/buttons/Button';
 import i18n from 'dashboard/i18n';
-
+import FluentIcon from 'shared/components/FluentIcon/DashboardIcon';
 import MoreActions from '../MoreActions';
 
 const localVue = createLocalVue();
@@ -13,6 +13,7 @@ localVue.use(Vuex);
 localVue.use(VueI18n);
 localVue.use(VTooltip);
 
+localVue.component('fluent-icon', FluentIcon);
 localVue.component('woot-button', Button);
 
 const i18nConfig = new VueI18n({