repl: support suppressing default commands

[avivkeller]

Fixes #57989 by supporting a defineDefaultCommands: false option (default true)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.35%. Comparing base (bc6e1ad) to head (a68bf1d).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66289      +/-   ##
==========================================
- Coverage   90.37%   90.35%   -0.03%     
==========================================
  Files         790      790              
  Lines      273807   273816       +9     
  Branches    52367    52375       +8     
==========================================
- Hits       247446   247394      -52     
- Misses      16869    16917      +48     
- Partials     9492     9505      +13     

Files with missing lines	Coverage Δ
lib/repl.js	92.94% <100.00%> (+0.01%)	⬆️

... and 28 files with indirect coverage changes

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