[MM-48049] Including users who were removed from group in not_in_group response (#21559)

Automatic Merge

store/sqlstore/user_store.go

@@ -1527,7 +1527,7 @@ func (us SqlUserStore) SearchInGroup(groupID string, term string, options *model
 func (us SqlUserStore) SearchNotInGroup(groupID string, term string, options *model.UserSearchOptions) ([]*model.User, error) {
 	query := us.usersQuery.
 		LeftJoin("GroupMembers gm ON ( gm.UserId = u.Id AND gm.GroupId = ? )", groupID).
-		Where("gm.UserId IS NULL").
+		Where("(gm.UserId IS NULL OR gm.deleteat != 0)").
 		OrderBy("Username ASC").
 		Limit(uint64(options.Limit))