test: use common spawnSync helpers in more tests

[greenheadHQ]

Replaces manual spawnSync() result assertions with the test/common/child_process helpers in eight tests, following the same approach as #65377. Every existing expectation (status, signal, stream contents) is preserved, and the helpers report the command and both streams when a check fails.

This also adds a signal check at call sites that previously only compared status, matching the helper defaults.

Only success-path blocks whose assertions map one-to-one onto the helper defaults are converted. blocks that assert bespoke failure modes are left unchanged.

Refs: #65377

[nodejs-github-bot]

Review requested:

• @nodejs/test_runner

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.07%. Comparing base (54b4e37) to head (c2fde19).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65552      +/-   ##
==========================================
- Coverage   90.13%   90.07%   -0.06%     
==========================================
  Files         751      751              
  Lines      253635   254075     +440     
  Branches    47786    47902     +116     
==========================================
+ Hits       228615   228862     +247     
- Misses      16268    16420     +152     
- Partials     8752     8793      +41     

see 41 files with indirect coverage changes

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