fix: migrate broken team authorize access mode (#39579)

* fix:  #39571
* ref: https://github.com/go-gitea/gitea/pull/38938#pullrequestreview-4945228548
* fix the bug in `assignTeamPermissionUnits` which can result in wrong team access

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>

modelmigration/v28/v356.go

@@ -1,25 +0,0 @@
-// Copyright 2026 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package v28
-
-import (
-	"context"
-
-	"gitea.dev/modelmigration/base"
-
-	"xorm.io/xorm"
-)
-
-// AddActionRunCommitSHAIndex indexes the runs lookup by commit, which the API `head_sha` filter uses.
-func AddActionRunCommitSHAIndex(_ context.Context, x base.EngineMigration) error {
-	type ActionRun struct {
-		CommitSHA string `xorm:"index"`
-	}
-
-	_, err := x.SyncWithOptions(xorm.SyncOptions{
-		IgnoreDropIndices: true,
-		IgnoreConstrains:  true,
-	}, new(ActionRun))
-	return err
-}