Add MySQL job to purge old GRA_*.log

[#74890134]
Allow services network name to be configurable
Remove outdated comment
Remove all references to storage_capacity_mb
Change default ib_log_file_size to original value to avoid breaking existing deployments
Refactor MySQL ctrl scripts for consistency

* Packaging includes compilation
* Executables have unique names for accurate pid finding (monit)

[#75989336]
"Background the galera-healthcheck process so the ctrl script can exit."