WebNN: Remove argmin/max selectLastIndex parameter
This CL removes the selectLastIndex parameter from argMin and argMax to
align with the spec change [1].
The changes include the definition of IDL and mojo, the implementation
of DirectML and TfLite backend and the related unit tests and WPT tests.
[1] webmachinelearning/webnn#722
Bug: 352314071, 40206287
Change-Id: Ifbb1c5b8c5eef41f87b279c2b1018d2d5d0198ea
Cq-Include-Trybots: luci.chromium.try:win11-blink-rel,mac14.arm64-blink-rel,mac14-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5700708
Reviewed-by: Phillis Tang phillis@chromium.org
Reviewed-by: Elly FJ ellyjones@chromium.org
Reviewed-by: ningxin hu ningxin.hu@intel.com
Commit-Queue: Bin Miao bin.miao@intel.com
Cr-Commit-Position: refs/heads/main@{#1328688}