Add permission reset after test writes to file

Problem/Motivation

One of the hook collector pass tests writes to core/modules/user/tests/modules/user_hooks_test/user_hooks_test.info.yml

This changes the permissions which inadvertently get committed. See https://git.drupalcode.org/project/drupal/-/merge_requests/13331#note_59...

Let's just reset the permissions in teardown to prevent this.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet