Skip calling the preinstall script from the docker wrapper

Prior to 11.0, it appears to me that the only thing this accomplished was creating the /var/log/gitlab/reconfigure directory. (The db backup, posgres version checking, and upgrade version checking would not run because the services folders is emptied before this runs, and any old files that could be used to check the old version aren't present in the image) Related: !663 (merged) and https://gitlab.com/gitlab-org/gitlab-ce/issues/13775

In 11.0 the script also added a config-check. This check normally wouldn't do anything when upgrading an docker image, because the config file it checks won't exist yet... But because we call the script on every startup of the image here in Docker, it causes the check to be run on every restart, even when its not an upgrade.

This causes issues, because if you ever have an error as a result of a incorrect reconfigure, the image won't start, which makes it pretty hard to fix.

Fixes: #3722 (closed)