feat(fill): emphasize that no tests were executed during a fill pytest session

[danceratopz]

🗒️ Description

Changes the terminal output to emphasize that fill did not test the client; rather it generated fixtures that can be executed against a client.

Before

After

🔗 Related Issues

✅ Checklist

• [x] All: Set appropriate labels for the changes.
• [ ] All: Considered squashing commits to improve commit history.
• [x] All: Added an entry to CHANGELOG.md.
• [x] All: Considered updating the online docs in the ./docs/ directory.
• [x] Tests: All converted JSON/YML tests from ethereum/tests have been added to converted-ethereum-tests.txt.
• [x] Tests: A PR with removal of converted JSON/YML tests from ethereum/tests have been opened.
• [x] 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.
• [x] Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.