code: async def remove_ssh_key(self, user, key):
          
          key_facade = client.KeyManagerFacade.from_connection(self.connection())
          key = base64.b64decode(bytes(key.strip().split()[1].encode('ascii')))
          key = hashlib.md5(key).hexdigest()
          key = ':'.join(a + b for a, b in zip(key[::2], key[1::2]))
          await key_facade.DeleteKeys([key], user)
docs: Remove a public SSH key(s) from this model.
  
          :param str key: Full ssh key
          :param str user: Juju user to which the key is registered