refactor(forks): pass fork overrides to clone

[JackCC703]

🗒️ Description

Move the fork override dataclass from ethereum_spec_tools.evm_tools.t8n into ethereum_spec_tools.forks, and pass it directly into Hardfork.clone.

This keeps the existing ForkCache.get(...) call surface unchanged while reducing the long Hardfork.clone(...) parameter list.

🔗 Related Issues or PRs

Follow-up to #2738.

✅ Checklist

• All: Ran fast static checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  just static

  just was not installed locally, so I ran the equivalent commands from the static recipe manually.
• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.
• Tests: For PRs implementing a missed test case, update the post-mortem document to add an entry the list.
• Ported Tests: All converted JSON/YML tests from ethereum/tests or tests/static have been assigned @ported_from marker.

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