Add invited group members to search results on assignees widget

app/assets/javascripts/graphql_shared/queries/users_search.query.graphql

@@ -2,7 +2,7 @@
 
 query usersSearch($search: String!, $fullPath: ID!) {
   workspace: project(fullPath: $fullPath) {
-    users: projectMembers(search: $search) {
+    users: projectMembers(search: $search, relations: [DIRECT, INHERITED, INVITED_GROUPS]) {
       nodes {
         user {
           ...User

changelogs/unreleased/326301-shared-group-members-in-project-cannot-be-selected-as-assignees-in.yml

+---
+title: Add invited group members to search results on assignees widget
+merge_request: 59152
+author:
+type: fixed