Fix pytest class-scoped fixture deprecation

[manav252]

Summary

• Convert the class-scoped framework_entries fixture to a classmethod.
• Avoid the pytest 10 deprecation warning for class-scoped fixtures defined as instance methods.

Validation

• PYTHONPATH=./scripts/hooks .venv/bin/pytest scripts/hooks/tests/test_frameworks_schema_v027.py -W error::pytest.PytestRemovedIn10Warning -q
• Result: 140 passed

Addresses #383.

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[davidlabianca]

Closing due to lack of CLA completion