test_runner: add env option to run function

[Ethan-Arrowood]

Support an env option that is passed to the
underlying child_process.
Fixes: #60709

[nodejs-github-bot]

Review requested:

• @nodejs/test_runner

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.52%. Comparing base (1bd7f62) to head (cd4d84e).
⚠️ Report is 18 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #61367   +/-   ##
=======================================
  Coverage   88.51%   88.52%           
=======================================
  Files         704      704           
  Lines      208739   208786   +47     
  Branches    40274    40306   +32     
=======================================
+ Hits       184770   184827   +57     
+ Misses      15968    15956   -12     
- Partials     8001     8003    +2     

Files with missing lines	Coverage Δ
lib/internal/test_runner/runner.js	93.02% <100.00%> (+0.07%)	⬆️

... and 39 files with indirect coverage changes

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