CORE-5597 Fixed irods-avu-migrator imports and deletes.

Updated the irods-avu-migrator.templates/add-metadata-avus function to also insert template_instances IDs.
Added the ipc-metadata-template meta_id to the list of IDs passed to the irods-avu-migrator.templates/remove-irods-avus function.
CORE-5597 Updated irods-avu-migrator to import only.

The prod icat_reader can't modify the ICAT.
CORE-5597 Removed irods-avu-migrator logging.

Logging is no longer necessary since ICAT rows are no longer being deleted.
Also, the timbre library was causing this tool to hang for a minute or 2 at shutdown.