chore: skip fulu fork spec tests

[nflaig]

We need to skip fulu fork in our spec tests for now as it otherwise will fail our ssz static tests on devnet-5 branch

Error: TypeError: Cannot read properties of undefined (reading 'AggregateAndProof')
 ❯ Object.fn test/spec/presets/ssz_static.test.ts:47:24
 ❯ test/spec/utils/specTestIterator.ts:152:28

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.61%. Comparing base (3dc5e8d) to head (52b78fe).
Report is 2 commits behind head on devnet-5.

Additional details and impacted files

@@            Coverage Diff            @@
##           devnet-5    #7343   +/-   ##
=========================================
  Coverage     48.61%   48.61%           
=========================================
  Files           603      603           
  Lines         40534    40534           
  Branches       2071     2071           
=========================================
  Hits          19707    19707           
  Misses        20789    20789           
  Partials         38       38