Add a neo4j 4.x data dump

[kevinschaper]

There's a first attempt at this in the Jenkinsfile already, but it's commented out because after loading, the neo4j database has no nodes and edges - it's a huge tar.gz, but for some reason everything is sitting in the transactions directory.

We need to run kgx transform into neo4j locally and inspect the output. It's possible that the neo4j transactions in kgx aren't getting closed?

[kevinschaper]

This is done, and available at https://data.monarchinitiative.org/monarch-kg-dev/latest/monarch-kg.neo4j.dump