This change was made in EE in MR
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14802, but this
was not backported to CE.

This backport changes made by EE to the files in the scripts/ directory.
This comes with a few changes to some scripts to make them work in the
single codebase setup.

Also, play manual jobs once dependency jobs are done instead of polling
for the dependent jobs to be finished.

Signed-off-by: Rémy Coutable <remy@rymai.me>

Never drop the database when granting privileges