webnn: Replace MLActivation with MLRecurrentNetworkActivation
Implements the changes from this spec PR:
webmachinelearning/webnn#718
Bug: 351866391
Cq-Include-Trybots: luci.chromium.try:mac14-blink-rel,mac14.arm64-blink-rel,win11-blink-rel
Change-Id: I163c85af63468a2ad4166509196ac3734d379df2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5689531
Commit-Queue: Austin Sullivan asully@chromium.org
Reviewed-by: Alex Gough ajgo@chromium.org
Cr-Commit-Position: refs/heads/main@{#1334041}