To reduce the number of `9:CreateRepositoryFromBundle: target directory
is non-empty` errors when retrying a import job, the repository folder
will be removed when the import fails.

Related to:
- https://sentry.gitlab.net/gitlab/gitlabcom/issues/1560601/
- https://gitlab.com/gitlab-org/gitlab/-/issues/216075
- https://gitlab.com/gitlab-org/gitlab/-/issues/24806