webnn: split elementwise-binary tests
The elementwise-binary web tests is too large and time out on Mac and
MSAN builds. Splitting it to be per operator, this is also easier for
debugging.
Fixed a bug with utils.js for handling large data. (some code was
removed during a previous autoroll)
Change-Id: Ibc04d1966598786c139a406f6381e2ea6ca50ce7
Bug: 345499788
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/+/5622981
Commit-Queue: Phillis Tang phillis@chromium.org
Reviewed-by: Austin Sullivan asully@chromium.org
Reviewed-by: Weizhong Xia weizhong@google.com
Cr-Commit-Position: refs/heads/main@{#1315315}