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/ingest.py

@@ -3,7 +3,7 @@
 import sys
 from pathlib import Path
 
-from ingest_envoy.ingestion_manifest_writer import EvlaCalIngestionManifestWriter
+from ingest_envoy.ingestion_manifest import IngestionManifest
 from ingest_envoy.utilities import ScienceProductType
 
 
@@ -24,6 +24,4 @@ def main():
     # ValueError will be thrown if ingestion_type isn't a known ScienceProductType
     ingestion_type = ScienceProductType.from_str(ingestion_type)
 
-    writer = EvlaCalIngestionManifestWriter(ingestion_type, source_dir)
-    writer.write_evla_cal_manifest(locator)
-    # IngestionManifest(source_dir, ingestion_type, locator).create()
+    IngestionManifest(source_dir, ingestion_type, locator).create()