ingestion manifest creation for EVLA CAL ingestion only

Next step is refactoring to IngestionManifestIF and having EVLA CAL ingestion manifest implement it, but I wanted to get this out there for review.

apps/cli/executables/pexable/ingest_envoy/ingest_envoy/ingestion_manifest.py

+""" This is the entrypoint for ingestion launching """
+
 import logging
 import sys
 from pathlib import Path
 
+# pylint: disable=R0903
 
 from ingest_envoy.ingestion_manifest_writer import EvlaCalIngestionManifestWriter
 from ingest_envoy.utilities import ScienceProductType