[Anshikakalpana]

PropertyDefinerCallback always defines on the sandbox. Built-in globals such as globalThis exist on the real global but not on the sandbox, so Object.defineProperty(globalThis, 'globalThis', {}) created a fresh property with default attributes (value: undefined, all flags false) instead of preserving the existing ones.

If the property is declared on the global but absent from the sandbox, return Intercepted::kNo so V8 performs the ordinary define on the real global, which preserves unspecified attributes.

Added a regression test to test-vm-property-definer-partial-update.js. It fails without the change and passes with it. test-vm-*, test-repl*, test-global* and test-util-inspect* pass locally.

Fixes: #67351

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.71%. Comparing base (9aa379e) to head (8a60d40).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #67365      +/-   ##
==========================================
- Coverage   90.72%   90.71%   -0.01%     
==========================================
  Files         798      798              
  Lines      280015   280020       +5     
  Branches    53858    53856       -2     
==========================================
- Hits       254046   254031      -15     
- Misses      16264    16282      +18     
- Partials     9705     9707       +2     

Files with missing lines	Coverage Δ
src/node_contextify.cc	81.74% <100.00%> (+0.12%)	⬆️

... and 23 files with indirect coverage changes

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