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docs: decommission gitaly servers for migration

Steve Xuereb requested to merge docs/gitaly-node-decomp into master

What

Change the migration plan to start with the newest Gitaly severs (nfs-file110) instead of the oldest one (file01)

Why

Before we where starting by draining nfs-file01 first and then moving to nfs-file02 and onwards. However this becomes a problem when we want to decommission the servers, we can't delete it because it's managed via terraform. Deleting nfs-file01 by hand will result in terraform state drift and it's not something we can easily solve.

Reference: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/24124

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