fix(execution,fixtures): Labeled formats comparison

[marioevz]

🗒️ Description

Fixes the following error:

================================================================ FAILURES ================================================================
__________________________ test_all_opcodes_in_container[fork_Osaka-blockchain_test_from_eof_test-opcode_STOP] ___________________________
tests/osaka/eip7692_eof_v1/eip3540_eof_v1/test_all_opcodes_in_container.py:115: in test_all_opcodes_in_container
    eof_test(
src/pytest_plugins/filler/filler.py:695: in __init__
    fixture = self.generate(
src/ethereum_test_specs/eof.py:464: in generate
    raise Exception(f"Unknown fixture format: {fixture_format}")
E   Exception: Unknown fixture format: <class 'ethereum_test_fixtures.blockchain.BlockchainFixture'>
============================================================ warnings summary ============================================================

Caused due to the comparison between the labeled fixture format and non-labeled ones during the fill process.

🔗 Related Issues

None

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• Tests: All converted JSON/YML tests from ethereum/tests have been added to converted-ethereum-tests.txt.
• Tests: A PR with removal of converted JSON/YML tests from ethereum/tests have been opened.
• Tests: Included the type and version of evm t8n tool used to locally execute test cases: e.g., ref with commit hash or geth 1.13.1-stable-3f40e65.
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.

[spencer-tb]

LGTM!