harmonize timezone used for our machines
Has been first reported in #62309#note-3 that our workers use inconsistent timezone which makes reading and especially comparing logs harder. Also see #65118#note-29 for another related reported. We should use UTC on all machines to have something fair for all our users and employees regardless where they are situated, without time jumps and consistent.
- AC1: All machines used within OSD infrastructure use UTC consistently for their internal timezone
- AC2: autoinst-log.txt files show UTC for new logs
- Either just change the timezone on all machines once and hope that in reinstalls we ensure the same and/or salt with https://docs.saltstack.com/en/latest/ref/states/all/salt.states.timezone.html#management-of-timezones