Do not store `Sample.metadata.sample_id` and `Sample.metadata.source_id` on bulk Sample metadata import

[shirey]

Do not store Sample.metadata.sample_id and Sample.metadata.source_id on bulk Sample metadata import as these fields are redundant to the provenance graph and in some cases have become out of sync when Samples have been "re-parented". Ensure that the Sample.metadata.source_id is still validated as the correct source at import time, though.

[yuanzhou]

Also make sure there's no direct Neo4j query from ingest-api to update the sample metadata. As https://github.com/hubmapconsortium/ingest-api/blob/main/src/app.py#L2754 is still being used.