feat(tests): implement eip-8070 sparse blob pool tests

[LouisTsai-Csie]

🗒️ Description

Add test coverage for EIP-8070: eth/72 - Sparse Blobpool, specifically the new engine_getBlobsV4 engine API endpoint.

🔗 Related Issues or PRs

N/A.

✅ Checklist

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

  just 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 updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.42%. Comparing base (d3baec8) to head (887d193).

Additional details and impacted files

@@               Coverage Diff                @@
##           forks/amsterdam    #2948   +/-   ##
================================================
  Coverage            93.42%   93.42%           
================================================
  Files                  625      625           
  Lines                37032    37032           
  Branches              3385     3385           
================================================
  Hits                 34597    34597           
  Misses                1666     1666           
  Partials               769      769           

Flag	Coverage Δ
unittests	93.42% <ø> (ø)

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[spencer-tb]

LGTM! 🗡️