Cleanup migrated components (#14625)

Cleans up migrated components by removing unnecessary old behaviour.

- Removes ng-template and ViewChild used by the old Modal Service.
- Remove aria-dismiss used by old Modals.
- Remove aria-haspopup and aria-expanded on bitMenuTriggerFor since it's handled by the directive.

bitwarden_license/bit-web/src/app/admin-console/providers/clients/clients.component.html

@@ -57,9 +57,6 @@
               bitMenuItem
               buttonType="secondary"
               type="button"
-              data-toggle="dropdown"
-              aria-haspopup="true"
-              aria-expanded="false"
               appA11yTitle="{{ 'options' | i18n }}"
             >
               <i class="bwi bwi-cog bwi-lg" aria-hidden="true"></i>