Trigger Repo Deletion Before Restore

What does this MR do and why?

Currently we schedule repos to be deleted using container.run_after_commit.

Repositories::DestroyService is usually called from Projects::DestroyService where afterward a commit is made to trigger the repo deletion.

In this issue a wiki repo is not being deleted during repo restoration and causes a repository exists already exception.

This is because the task is not triggered as nothing is committed to the project (container from above).

This MR triggers the deletion by using project.touch.

Closes #375138 (closed).

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