TPA-RFC-77: plan Merge of Tails' and Tor's Puppet servers
References: - [[TPA-RFC-73: Tails infra merge roadmap - Puppet server|/policy/tpa-rfc-73-tails-infra-merge-roadmap#puppet-server]] - [[TPA-RFC-77: Tails and TPA Puppet codebase merge|/policy/tpa-rfc-77-puppet-merge]] Steps: - [x] #41819+ - [x] come up with a plan ([[TPA-RFC-77|/policy/tpa-rfc-77-puppet-merge]]) - [x] detail costs ([ref](https://gitlab.torproject.org/tpo/tpa/wiki-replica/-/merge_requests/68#note_3153846)) - [x] add a timeline ([ref](https://gitlab.torproject.org/tpo/tpa/wiki-replica/-/merge_requests/68#note_3153847)) - [x] split the tasks in bite-sized issues This blocks: - #41946+
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