feat(specs): verify intermidiate block state in blockchain test

[winsvega]

🗒️ Description

Allow verification of individual block states in blockchain test

🔗 Related Issues

#1033

✅ 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.

[winsvega]

add a unit test to
src/ethereum_test_specs/tests/test_expect.py

[marioevz]

Looks good to me, just a few comments.

[marioevz]

LGTM, I made some fixes to the test added and the unit test too.
I'll wait until CI passed and then merge, thanks!

[marioevz]

Once #1085 is merged we can rebase and CI should be green.