fix: preserve Request signal abort propagation after GC

[mcollina]

Summary

Fix Request signal following so abort propagation still works after GC pressure.

This replaces the custom WeakRef/FinalizationRegistry-based follow logic in lib/web/fetch/request.js with AbortSignal.any([signal]).

Changes

• use AbortSignal.any([signal]) to create dependent request signals
• add a regression test for a Request signal surviving GC pressure
• add a regression test for cloned Request signals surviving GC pressure
• add a regression test to ensure reusing a controller across transient requests does not emit listener leak warnings

Motivation

This reproduces the behavior discussed in:

• Request signal isn't aborted after garbage collection node#55428

The old implementation could disconnect request.signal from its parent signal once the original Request object became unreachable. As a result, aborting the parent signal no longer aborted the dependent request signal.

Testing

• NODE_OPTIONS=--expose-gc node --test test/fetch/request.js
• NODE_OPTIONS=--expose-gc node --test test/fetch/long-lived-abort-controller.js test/node-fetch/request.js test/fetch/abort.js

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.95%. Comparing base (bbd66d0) to head (ca4c9bc).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4984   +/-   ##
=======================================
  Coverage   92.95%   92.95%           
=======================================
  Files         110      110           
  Lines       35773    35680   -93     
=======================================
- Hits        33252    33166   -86     
+ Misses       2521     2514    -7     

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