refactor(benchmark): update starting fork from prague

[LouisTsai-Csie]

🗒️ Description

In the previous PR, we update the benchmark CI to start from Prague. But when running fill locally, it still starts from Homestead/Frontier.

Example command:

uv run fill -v tests/benchmark/test_worst_compute.py::test_worst_swap -m benchmark --clean --gas-benchmark-values 1 --from=Prague -k "SWAP16"

This PR adds a filter that:

• Runs the test from the specified fork if a valid_from marker is provided.
• Otherwise, runs the test starting from Prague.

As a result, i remove all the redundant marker (from Cancun).

🔗 Related Issues or PRs

None

✅ Checklist

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

  uvx --with=tox-uv tox -e lint,typecheck,spellcheck,markdownlint

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered adding an entry to CHANGELOG.md.
• 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.

[spencer-tb]

Nice addition. LGTM. Thanks!