http: fix rawHeaders exceeding maxHeadersCount limit

[Meltedd]

Fixes: #61284

[nodejs-github-bot]

Review requested:

• @nodejs/http
• @nodejs/net

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.53%. Comparing base (502b5d5) to head (ab1d73e).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61285      +/-   ##
==========================================
+ Coverage   87.99%   88.53%   +0.53%     
==========================================
  Files         704      704              
  Lines      208759   208761       +2     
  Branches    40190    40279      +89     
==========================================
+ Hits       183696   184824    +1128     
+ Misses      17003    15942    -1061     
+ Partials     8060     7995      -65     

Files with missing lines	Coverage Δ
lib/_http_common.js	100.00% <100.00%> (ø)

... and 103 files with indirect coverage changes

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