util: honor breakLength Infinity when depth is Infinity

[Han5991]

util.inspect() was still inserting line breaks when both breakLength and depth were set to Infinity. Grouping logic and the compact
inline heuristics were ignoring the special “no wrapping” intent. This change adds an isUnlimitedDepth() guard so the line-wrapping paths
are skipped when the user explicitly asks for infinite width and depth.

Fixes: #60475

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.51%. Comparing base (b1e941e) to head (545a24f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60783      +/-   ##
==========================================
+ Coverage   88.50%   88.51%   +0.01%     
==========================================
  Files         703      703              
  Lines      208394   208404      +10     
  Branches    40189    40197       +8     
==========================================
+ Hits       184430   184479      +49     
+ Misses      15965    15925      -40     
- Partials     7999     8000       +1     

Files with missing lines	Coverage Δ
lib/internal/util/inspect.js	99.67% <100.00%> (+0.06%)	⬆️

... and 27 files with indirect coverage changes

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[BridgeAR]

Thank you for the PR!

The issue is actually that compact does not take into account that breakLength might be infinite. A simpler fix is to just add && !NumberIsFinite(ctx.breakLength) next to https://github.com/nodejs/node/pull/60783/files#diff-ee826b416a72014ac81621cf3ecaeec6adcc40163f60775d157aa94618c80201R2627

That should result in the expected output.

[Han5991]

@BridgeAR
Thanks for the pointer! I added the NumberIsFinite(ctx.breakLength) guard to the groupArrayElements call in reduceToSingleString, so breakLength: Infinity
skips compact grouping. Also added a test to ensure arrays stay single-line with breakLength: Infinity even when depth is finite