src: remove orphaned js_udp_wrap test binding

[Renegade334]

The test-only js_udp_wrap binding was added in #33380, and the test utility it backed was removed in #54825, leaving it orphaned.

It is not visible via process.binding(), so removing it should be a formality.

[nodejs-github-bot]

Review requested:

• @nodejs/gyp

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/78080/

[addaleax]

Is this something that would be used/useful for the upcoming QUIC work? Asking because the TCP equivalent is for HTTP/1.1 and HTTP/2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.40%. Comparing base (e6b3f96) to head (6b17ea3).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66399      +/-   ##
==========================================
+ Coverage   90.38%   90.40%   +0.02%     
==========================================
  Files         792      791       -1     
  Lines      275517   275392     -125     
  Branches    52813    52788      -25     
==========================================
- Hits       249017   248965      -52     
+ Misses      16912    16840      -72     
+ Partials     9588     9587       -1     

Files with missing lines	Coverage Δ
src/node_binding.cc	70.79% <ø> (ø)

... and 29 files with indirect coverage changes

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[Renegade334]

Is this something that would be used/useful for the upcoming QUIC work? Asking because the TCP equivalent is for HTTP/1.1 and HTTP/2

I'm fairly confident that the answer is no, Brand New Quic™ endpoints don't wrap UDP handles in the JS layer like the mothballed implementation did, they initialise and store their own private Endpoint::UDP handles in C++.