fix(web-outgoing): strip transfer-encoding on 204/304

[pi0]

Summary

• Strip transfer-encoding header on 204 (No Content) and 304 (Not Modified) proxy responses
• Per RFC 9110, these status codes must not contain a message body, making transfer-encoding invalid
• Adds regression tests for 204, 304, and a negative test for normal 200 responses

Upstream: http-party/node-http-proxy#1396

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.47%. Comparing base (f30f90f) to head (3734858).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   96.12%   96.47%   +0.35%     
==========================================
  Files           8        8              
  Lines         645      710      +65     
  Branches      243      289      +46     
==========================================
+ Hits          620      685      +65     
  Misses         24       24              
  Partials        1        1              

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 34e53e22-fe21-4fca-8bb3-4e6d900db0e5

📥 Commits

Reviewing files that changed from the base of the PR and between 9cd99ac and 3734858.

📒 Files selected for processing (2)

• src/middleware/web-outgoing.ts
• test/middleware/web-outgoing.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/remove-chunked-204-304

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