[Bug] RDF node/edge totals do not match expected totals in Neptune

## Description

When using Neptune and the summary API, the total node and edge counts for a RDF data set in Graph Explorer are inconsistent with what I would expect.

Using the Airports sample data here are the counts for RDF

And here are the counts for Gremlin

If I disable the summary API calls in the code I see numbers that much more closely match my expectations.

## Environment

- OS: macOS 14.5
- Browser: Arc
- Graph Explorer Version: 1.8
- Graph Database & Version: Amazon Neptune 1.3.2

## Steps to Reproduce

1. Create blank Neptune database
2. Seed with Airports sample data for both property graph and RDF
3. Create notebook for Neptune database
4. Open Graph Explorer
5. Observe node and edge count differences between property graph and RDF

## Expected Behavior

The node and edge counts should be consistent

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