Update validate to apply catalogs/schemas used as input across all ingested schemas

[jordanpadams]

The second portion of integration test testGithub71 uses a catalog file to determine schemas, yet, still fails when no internet connection is provided.

From the output, it looks like it sufficiently uses the local PDS dictionary for the label, but then since the TEST schema references, the PDS schema again, it doesn't apply the catalog information.

e.g. it tries to resolve the following over the internet:
<xsd:import namespace="http://pds.nasa.gov/pds4/pds/v1" schemaLocation="https://pds.nasa.gov/pds4/pds/v1/PDS4_PDS_1700.xsd">