Error messages from custom pre-receive hooks now appear in the GitLab
UI.
This is re-enabling a feature that had been disabled in merge request
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18646
The feature had been disabled due to security concerns that information
which was not intended to be public (like stack traces) would leak into
public view.
PreReceiveErrors (from pre-receive, post-receive and update custom
hooks) are now filtered for messages that have been prefixed in a
particular way.
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/48132
This recently changed on the Gitaly side, but now spotted this in the
docs for the next release. Updated to be more precise, and to signal
users should not want control over this specific hook location.
