Fix _upsample_bilinear2d_aa portable kernel correctness

[arkadip-maitra]

Summary

Fixes #13969

Fix _upsample_bilinear2d_aa portable kernel correctness for anti-aliased downsampling by removing the 4 tap contributor limit and matching PyTorch’s full support window.

Added portable tests and corrected tolerance in test file

[pytorch-bot]

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⚠️ 11 Awaiting Approval

As of commit d052f55 with merge base 4af91c3 ():

AWAITING APPROVAL - The following workflows need approval before CI can run:

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• Test XNNPACK Backend (gh)

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