Scaleway Mac mini pool releases avoid the 24-hour billing floor

The Scaleway Apple Silicon provider now returns pool-adopted Mac minis to the pre-ordered host pool instead of deleting them. When a Machine is deleted or scaled down, the controller renames the server back into the pool namespace and triggers a Scaleway OS reinstall. The host stays alive, is reset to factory state, and becomes eligible for future adoption once it is Ready again. This removes the 24-hour Apple licensing billing floor from the cluster deployment path, so MachineDeployments no longer hang waiting for Scaleway to allow physical deletion. Operators can still force physical destruction on broken hosts by annotating the Machine with tuist.dev/release-policy=terminate.