refactor(ic-admin): [CON-1637] halt a subnet without necessarily provisioning SSH keys#9780

pierugo-dfinity wants to merge 3 commits intomasterdfinity/ic:masterfrom

pierugo/ic-admin/optional-keys-when-haltingPdfinity/ic:pierugo/ic-admin/optional-keys-when-haltingPCopy head branch name to clipboard