lib: default node:bench warmup to 10 invocations

[RafaelGSS]

By default, I expect node:bench to have its proper warm-up.

What do you think? @jasnell

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.39%. Comparing base (bbd566d) to head (c3d2725).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66536      +/-   ##
==========================================
- Coverage   92.74%   90.39%   -2.36%     
==========================================
  Files         422      791     +369     
  Lines      193170   275991   +82821     
  Branches    29783    52982   +23199     
==========================================
+ Hits       179160   249487   +70327     
- Misses      13682    16905    +3223     
- Partials      328     9599    +9271     

Files with missing lines	Coverage Δ
lib/internal/bench_runner/benchmark.js	99.65% <100.00%> (ø)

... and 499 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/78189/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/78200/