[TECH] Improve code quality

ui/ui-frontend/projects/identity/src/app/group/group-list/group-criteria-builder.util.ts

@@ -69,6 +69,6 @@ const GROUP_FILTER_CONVERTER: Readonly<{ [key: string]: (values: any[]) => Array
   }
 };
 
-export function buildCriteriaFromGroupFilters(filterMap: { [key: string]: any[] }) {
+export function buildCriteriaFromGroupFilters(filterMap: { [key: string]: any[] }): Array<Criterion | SearchQuery> {
   return buildCriteriaFromFilters(filterMap, GROUP_FILTER_CONVERTER);
 }

ui/ui-frontend/projects/identity/src/app/group/group-list/group-list.component.ts

@@ -81,6 +81,7 @@ export class GroupListComponent extends InfiniteScrollTable<Group> implements On
   // tslint:disable-next-line:variable-name
   private _search: string;
   private readonly searchKeys = [
+    'identifier',
     'name',
     'level',
     'description'