feat(fw): Add `is_state_test` flag to `Environment`

[marioevz]

🗒️ Description

Adds a flag isStateTest into the environment information that is passed to the t8n tool which is only set to true when executing the state tests, and should inhibit any block-level operations in order to reduce the changes to the state that are produced by:

• The mining reward
• Block Withdrawals
• System operations

🔗 Related Issues

None

✅ Checklist

• [x] All: Set appropriate labels for the changes.
• [x] 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.