Provenance Validator slowness & network dependency

[matthew-a-dunlap]

There are two notable issues with the Provenance validator:

1. The validator is loaded synchronously, causing the first load of the dataset page after deployment to take an extra ~8 seconds
2. When the validator loads the schema, it attempts to connect to the ID url in the schema for the additional information needed by the $ref tags https://json-schema.org/understanding-json-schema/structuring.html#the-id-property

These cause dataverse to fail loading the dataset page without a network, and when there is a network the first load of the provenance validator is still slow.

[matthew-a-dunlap]

It looks like both of these issues are solved by the same fix. The cause of the schema loader slowdown was due to our system downloading this "core schema" file from http://provenance.ecs.soton.ac.uk/prov-json/schema# . Folding both schemas together the load time is negligible.