Make script to move validator configuration conditionally

Existing configuration for validators is at /hippo:configuration/hippo:frontend/cms/cms-validators. New configuration is bootstrapped at /hippo:configuration/hippo:modules/validation/hippo:moduleconfig.

Old configuration should be removed, but only if it is not modified by the developers in the client project. The contentblocks-validator configuration must not be moved.

Write a migration/updater script that converts the old validators to the new ones:

for all known-validator-names
  if plugin.class matches expected default
    if regexp_pattern exists
      copy-to-new-validator
    delete old validator node
  else
    disable new validator