[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>

api4/group.go

@@ -1185,8 +1185,8 @@ func restoreGroup(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if !c.App.SessionHasPermissionToGroup(*c.AppContext.Session(), c.Params.GroupId, model.PermissionDeleteCustomGroup) {
-		c.SetPermissionError(model.PermissionDeleteCustomGroup)
+	if !c.App.SessionHasPermissionToGroup(*c.AppContext.Session(), c.Params.GroupId, model.PermissionRestoreCustomGroup) {
+		c.SetPermissionError(model.PermissionRestoreCustomGroup)
 		return
 	}