refactor: reuse wrapRequestBody in RedirectHandler

[trivikr]

This relates to...

Reuse wrapRequestBody written in #3294

Rationale

RedirectHandler duplicated request body wrapping and disturbance tracking logic that already exists in lib/core/util.js as wrapRequestBody(). Reusing the shared helper brings redirect handling onto the same path as retry handling and reduces the risk of the two implementations drifting.

Changes

• Replace the redirect-local body wrapping logic with util.wrapRequestBody() in RedirectHandler
• Remove the private BodyAsyncIterable and duplicated stream disturbance handling from redirect-handler.js
• Add redirect coverage for async iterable request bodies to verify the shared wrapping behavior

Features

N/A

Bug Fixes

N/A

Breaking Changes and Deprecations

N/A

Status

• I have read and agreed to the Developer's Certificate of Origin
• Tested
• Benchmarked (optional)
• Documented
• Review ready
• In review
• Merge ready

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.92%. Comparing base (51cc6cb) to head (b852e35).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4992      +/-   ##
==========================================
+ Coverage   92.86%   92.92%   +0.05%     
==========================================
  Files         110      110              
  Lines       35788    35738      -50     
==========================================
- Hits        33236    33210      -26     
+ Misses       2552     2528      -24     

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[mcollina]

lgtm