webnn: add WPT tests to cover the label for more operators
This CL adds more validation tests to cover the label setting for all
remaining operators.
Bug: 354513206
Change-Id: Id2be1768e4368d1ff181549c0d46d4c853cb107d
Cq-Include-Trybots: luci.chromium.try:win11-blink-rel,mac14.arm64-blink-rel,mac14-blink-rel, linux-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5761183
Reviewed-by: ningxin hu ningxin.hu@intel.com
Reviewed-by: Austin Sullivan asully@chromium.org
Commit-Queue: Lisha Guo lisha.guo@intel.com
Cr-Commit-Position: refs/heads/main@{#1341624}