Deprecation first needs a warning, then an error, then a removal, each of which separated by at least one release if not more.

• utillinux: drop alias, don't throw #192870 skips these steps entirely for this release, going straight from not even a warning to removal. This is not acceptable and needs to be reverted.
• Prune old aliases #192681 skips the warning step and directly throws an error. This is not okay, a warning needs to be thrown first, this PR needs adjustments.