http: harden ClientRequest options merge

[mcollina]

No description provided.

[nodejs-github-bot]

Review requested:

• @nodejs/http
• @nodejs/net

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.64%. Comparing base (c3dd52a) to head (4eb2155).
⚠️ Report is 146 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #63082      +/-   ##
==========================================
+ Coverage   89.61%   89.64%   +0.03%     
==========================================
  Files         706      712       +6     
  Lines      219136   220498    +1362     
  Branches    41981    42277     +296     
==========================================
+ Hits       196376   197669    +1293     
+ Misses      14671    14664       -7     
- Partials     8089     8165      +76     

Files with missing lines	Coverage Δ
lib/_http_client.js	97.43% <100.00%> (+<0.01%)	⬆️

... and 109 files with indirect coverage changes

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