Project templates on disk should NOT use object storage
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=23089) </details> <!--IssueSummary end--> After https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20773 is merged and with the feature flag `import_export_object_storage` ON, the templates will be uploaded to object storage where we could take advantage of using the GitLab repo instead. Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/46246
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