Enable the ability to use the force env for rebuilding authorized_keys during a restore

What does this MR do?

Add a check for the force environment variable when rebuilding authorized_keys during a restore.

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/7686

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides