refactor: port systemd unit parsing from switch-to-configuration-ng

Use freedesktop_entry_parser to parse unit files

feat: implement X-RestartIfChanged=false in service activation

bump nix version in nix-artifacts

feat: add --verbose flag for debug logging

Update nix-vm-test

cargo update

testFlake/flake.lock: Update

flake.lock: Update

etc_files tests: activate profile twice in deactivation test

etc_files: support again --ephemeral

state: backup v0 state before migration

fix: properly default statev1 version to 1.

fix: ignore directories during state migration

chrore: write log message after state migration