test_runner: support test order randomization

[pmarchini]

This PR adds test-file randomization to the test runner.

--test-randomize executes test files in randomized order, and --test-random-seed=<seed> replays the same order deterministically. When no seed is provided, one is generated and printed to make reproduction straightforward.

[nodejs-github-bot]

Review requested:

• @nodejs/config
• @nodejs/test_runner

[codecov]

Codecov Report

❌ Patch coverage is 93.44262% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.72%. Comparing base (ae2ffce) to head (e6f9a59).
⚠️ Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/test_runner/utils.js	88.40%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61747      +/-   ##
==========================================
- Coverage   89.75%   89.72%   -0.03%     
==========================================
  Files         674      675       +1     
  Lines      204416   204647     +231     
  Branches    39285    39321      +36     
==========================================
+ Hits       183472   183627     +155     
- Misses      13227    13293      +66     
- Partials     7717     7727      +10     

Files with missing lines	Coverage Δ
lib/internal/test_runner/runner.js	93.47% <100.00%> (+0.32%)	⬆️
src/node_options.cc	76.47% <100.00%> (+0.19%)	⬆️
src/node_options.h	97.92% <100.00%> (+0.03%)	⬆️
lib/internal/test_runner/utils.js	64.52% <88.40%> (+2.49%)	⬆️

... and 45 files with indirect coverage changes

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