chore: remove redundant code in node integration #33500
Merged
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Description of Change
In the node integration code, on Linux and macOS we have code checking whether the backend fd is changed to prevent duplicate initializations. But since the backend fd of default uv loop is never changed, the code is essentially just preventing double initialization, which is identical to the Windows code.
This PR removes redundant check of backend fd and changes the code to use same routine on all platforms.
The code was introduced in #25869 and #27582, and I can verify the original issues are not regressed.
Release Notes
Notes: none