webnn: add WPT conformance test cases of gather's out-of-bound indices
This CL adds the following conformance tests in WPT for gather with
- negative indices
- out-of-bound positive indices
- out-of-bound negative indices
Cq-Include-Trybots: luci.chromium.try:mac14-blink-rel,win11-blink-rel,mac14.arm64-blink-rel
Bug: 329134204
Change-Id: I72519939086ed9eb2da464df221a5b7c02c88a7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5553679
Commit-Queue: Shiyi Zou shiyi.zou@intel.com
Reviewed-by: Austin Sullivan asully@chromium.org
Reviewed-by: ningxin hu ningxin.hu@intel.com
Auto-Submit: Shiyi Zou shiyi.zou@intel.com
Cr-Commit-Position: refs/heads/main@{#1310415}