Fix multi label/class support in neighbor counts

[kmcginnes]

Description

Fixes a long standing issue around neighbor counts when calculated with neighbors having multiple labels/classes.

• Use the loading style notification for neighbor expansion
• Sparql now executes two queries to get neighbor counts
  • Unique neighbors - gets total count of unique resource neighbors
  • By type neighbors - gets count of neighbors grouped by types (could have the same neighbor in more than one type count)
• Update fetched neighbor counts to include a count for each type per neighbor
• Update gremlin & openCypher neighbor count mapping to count by type separate from unique neighbors
• Don't allow negative unfetched counts

Validation

• Tested in multiple data sets (air routes, premiere league, generated, nobel prize)
• Ensured neighbor expansion filtered by type works properly
• Known limitation: blank nodes are still not 100% correct, but this is a separate issue
• Known limitation: schema sync counts and type list are not 100% correct, but this is a separate issue

Related Issues

• Resolves Multi-label support handles neighbor counts incorrectly #746
• Blank node neighbor counts are incorrect #1193
• Schema sync does not properly count and list multi-label nodes #1212

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[codecov]

Codecov Report

❌ Patch coverage is 89.18919% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.21%. Comparing base (6070a74) to head (343a19a).
⚠️ Report is 66 commits behind head on main.

Files with missing lines	Patch %	Lines
...raph-explorer/src/utils/testing/graphsonHelpers.ts	78.94%	8 Missing ⚠️
...ph-explorer/src/connector/sparql/neighborCounts.ts	91.13%	7 Missing ⚠️
...graph-explorer/src/core/StateProvider/neighbors.ts	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1194      +/-   ##
==========================================
+ Coverage   33.94%   37.21%   +3.26%     
==========================================
  Files         524      529       +5     
  Lines       21535    23647    +2112     
  Branches     1563     1963     +400     
==========================================
+ Hits         7310     8800    +1490     
- Misses      14111    14738     +627     
+ Partials      114      109       -5     

Flag	Coverage Δ
unittests	37.21% <89.18%> (+3.26%)	⬆️

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