Monitor if isobuilders systems are running fine

We experienced times where our isobuilders were slowly getting all down when a branch was triggering the OOM during its build.

We should use our monitoring system to check using systemd and/or anything else if the isobuilders systems are running fine, so that we know if we have to restart them or their jenkins-slave service.

Feature Branch: puppet-tails:feature/11858-monitor-systemd

Related issues

Related to #11632 (closed)
Related to #12009 (closed)
Related to #13582 (closed)
Blocks #13242
Blocked by #8508 (closed)

Original created by @bertagaz on 11858 (Redmine)

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