lib: limit split function calls to prevent excessive array length

[gurgunday]

Speeds up split calls by returning early when we reach the desired length

Some of these split calls are used for string replacement, I'll do another pass converting those to StringPrototypeReplaceAll afterward

[nodejs-github-bot]

Review requested:

• @nodejs/loaders
• @nodejs/test_runner

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.23%. Comparing base (8a5a849) to head (4aa870e).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/test_runner/utils.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #57501   +/-   ##
=======================================
  Coverage   90.22%   90.23%           
=======================================
  Files         629      629           
  Lines      184847   184846    -1     
  Branches    36207    36205    -2     
=======================================
+ Hits       166780   166797   +17     
- Misses      11015    11019    +4     
+ Partials     7052     7030   -22     

Files with missing lines	Coverage Δ
lib/internal/blob.js	99.80% <100.00%> (ø)
lib/internal/debugger/inspect.js	93.98% <100.00%> (ø)
lib/internal/errors.js	97.47% <100.00%> (ø)
lib/internal/modules/cjs/loader.js	98.26% <100.00%> (ø)
lib/internal/modules/esm/module_job.js	98.27% <100.00%> (ø)
lib/internal/repl/await.js	98.09% <100.00%> (ø)
lib/internal/tty.js	97.04% <100.00%> (ø)
lib/internal/util/debuglog.js	95.21% <100.00%> (+<0.01%)	⬆️
lib/internal/worker/js_transferable.js	98.55% <100.00%> (ø)
lib/tls.js	95.93% <100.00%> (ø)
... and 1 more

... and 35 files with indirect coverage changes

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[BridgeAR]

If we want to improve the performance, we should actually do the splitting manually by checking with indexOf and slicing out the variables we need. The same applies to multiple other places here.

This particular case will only improve the performance in case the pathname is rather untypical.

[gurgunday]

I was going to do that in another pass, same for replacements where we can just use replaceAll

Can I do that or would you like to combine them all?

[gurgunday]

And btw current behavior rejects if more than 1 occurrence of : is found, so using split here kinda makes sense to get that number before continuing further