Patrick Steinhardt authored Jul 15, 2022 and Robert Marshall committed Jul 15, 2022

The `self_signed_cert` setting that had been part of the gitlab-shell
configuration has been deprecated in v14.8 and removed in v15.0 without
any replacement. Administrators must instead make sure that they install
any self-signed certificates into `/etc/gitlab/trusted-certs`.

Follow through with the deprecation and remove the setting where it's
still passed down. This most importantly also includes Gitaly and
Praefect, which reuse the configuration injected via gitlab-shell. Given
that we have already gone through the deprecation phase of this toggle
it's not necessary to go through the same deprecation cycle again for
these projects.

Changelog: deprecated