merge_pr_46971

WebNN: Emulate gelu with decomposed operations

This CL uses the decompose operation to emulate the gelu for DirectML
backend when the DirectML feature level is lower than 5.1.

Bug: 40206287
Change-Id: Iaf472b53b4c6bdcad80ff02dd6b208b4e2df9a3c
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/+/5649158
Commit-Queue: Bin Miao bin.miao@intel.com
Reviewed-by: ningxin hu ningxin.hu@intel.com
Reviewed-by: Rafael Cintron rafael.cintron@microsoft.com
Cr-Commit-Position: refs/heads/main@{#1322514}