lib: set exit code on failed node:bench run()

[RafaelGSS]

I noticed the run() was exiting with exitCode 0 even when the benchmark fn fails

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.39%. Comparing base (773bdd1) to head (6401472).
⚠️ Report is 59 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66534      +/-   ##
==========================================
- Coverage   90.42%   90.39%   -0.03%     
==========================================
  Files         790      791       +1     
  Lines      275421   275995     +574     
  Branches    52830    52973     +143     
==========================================
+ Hits       249052   249494     +442     
- Misses      16776    16912     +136     
+ Partials     9593     9589       -4     

Files with missing lines	Coverage Δ
lib/internal/bench_runner/harness.js	98.95% <100.00%> (+<0.01%)	⬆️

... and 49 files with indirect coverage changes

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