Whitelist project check (git fsck) failures
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## Problem to solve
Large upstream repository mirrors sometime fail the repository check due to various reasons. The problems cannot really be fixed but instead result in a weekly mail to the GitLab admins. For example the Libreoffice core repository contains commits where a whitespace between the name and mail address is missing:
https://github.com/LibreOffice/core/commit/1c239d78bc47f52b5d1341644cccb9835181be3d
## Proposal
Allow admins to whitelist projects, so that failures are ignored for these project, but other project failures can be prevented.
## Links / references
issue