[MM-44842] Add restore_group permission (#21806)

* Add restore_group permission

* Fix tests failing due to new permission in groups

* Add new migration to add custom_group_restore permission

* Add mock for new migration function

* Fix tests

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/migration.go

@@ -39,4 +39,5 @@ const (
 	MigrationKeyAddCustomUserGroupsPermissions         = "custom_groups_permissions"
 	MigrationKeyAddPlayboosksManageRolesPermissions    = "playbooks_manage_roles"
 	MigrationKeyAddProductsBoardsPermissions           = "products_boards"
+	MigrationKeyAddCustomUserGroupsPermissionRestore   = "custom_groups_permission_restore"
 )