feat(tests): add more sload/sstore combos

[jochem-brouwer]

🗒️ Description

This tests adds the 10-90 and 30-70 scenarios to the SLOAD-SSTORE multi-opcode tests to help triaging the worst case.

✅ Checklist

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

  uvx tox -e static

• 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.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.08%. Comparing base (705739a) to head (be03a30).
⚠️ Report is 6 commits behind head on forks/osaka.
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Additional details and impacted files

@@             Coverage Diff              @@
##           forks/osaka    #1794   +/-   ##
============================================
  Coverage        86.08%   86.08%           
============================================
  Files              743      743           
  Lines            44072    44072           
  Branches          3891     3891           
============================================
  Hits             37938    37938           
  Misses            5656     5656           
  Partials           478      478           

Flag	Coverage Δ
unittests	86.08% <ø> (ø)

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