Rescan Yggdrasil UTXO Helper

We had a case where an older node with a Yggdrasil vault was unable to leave because the vault contained UTXOs that were not indexed, since the node was pointed at new UTXO daemons and the Yggdrasil vault was initially imported without a rescan. This just adds a convenience target to automatically import with rescan on a given node's Yggdrasil vaults.