esm: make hasAsyncGraph non-enumerable

[joyeecheung]

Otherwise the debug() calls would attempt to display it and throws an error.

[nodejs-github-bot]

Review requested:

• @nodejs/loaders
• @nodejs/vm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.28%. Comparing base (58f408f) to head (619a1a2).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #59905      +/-   ##
==========================================
- Coverage   88.29%   88.28%   -0.01%     
==========================================
  Files         702      702              
  Lines      206875   206905      +30     
  Branches    39797    39809      +12     
==========================================
+ Hits       182655   182670      +15     
- Misses      16226    16251      +25     
+ Partials     7994     7984      -10     

Files with missing lines	Coverage Δ
src/module_wrap.cc	75.44% <100.00%> (+0.02%)	⬆️

... and 31 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69262/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69265/