CI: Enforce Squid Project review process voting (#2067)

CI: Enforce Squid Project review process voting (#2067)

Implement the Squid Project merge procedure voting criteria
documented at https://wiki.squid-cache.org/MergeProcedure#votes
as a github action that can be applied as a merge requirement.

This will make the Squid merge procedure voting apply to prevent
Anubis bot attempting to start merge checks before approval limits,
as well as disabling github UI buttons.

Also, currently we rely on Anubis bot to enforce a 48hr hold. This
hold is added to the voting criteria checked.