streams: simplify readableStreamFromIterable

[aduh95]

The intent is to make the code easier for both humans and V8

[codecov]

Codecov Report

❌ Patch coverage is 73.91304% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.81%. Comparing base (e6ef477) to head (013a1e4).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/webstreams/readablestream.js	73.91%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #62651    +/-   ##
========================================
  Coverage   89.81%   89.81%            
========================================
  Files         697      699     +2     
  Lines      215773   216160   +387     
  Branches    41279    41311    +32     
========================================
+ Hits       193786   194137   +351     
- Misses      14093    14136    +43     
+ Partials     7894     7887     -7     

Files with missing lines	Coverage Δ
lib/internal/webstreams/util.js	99.57% <ø> (+4.92%)	⬆️
lib/internal/webstreams/readablestream.js	98.33% <73.91%> (-0.01%)	⬇️

... and 63 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/72594/