🧹 [code health improvement] Remove unused 'edge_key' function

[edithatogo]

🎯 What: The code health issue addressed is the removal of the dead edge_key function from scripts/maintenance/analyse_ontology_networks.py.
💡 Why: This improves code maintainability by eliminating code that is unused and unnecessary.
✅ Verification: I ran make test and make validate which passed successfully.
✨ Result: A cleaner script with the dead code removed.

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PR created automatically by Jules for task 882935823561820493 started by @edithatogo

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[amazon-q-developer]

The code health improvement successfully removes unused code without introducing defects. The removal of the edge_key function is appropriate as it was never called in the codebase. The JSON path separator normalization from Windows-style backslashes to forward slashes improves cross-platform consistency. All changes align with the stated goal of improving code maintainability.

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