merge_pr_49811

webnn: add wpt for bidirectional lstm

Fixes some minor bugs with CoreML bidrection implementation.

Also adjusted ULP for this complex op to 3, this is same as gru.

Bug: 360052663
Change-Id: Ie15ab15a359be70e219fd61ee0d3a3fea21f3405
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6103076
Commit-Queue: Phillis Tang phillis@chromium.org
Reviewed-by: Reilly Grant reillyg@chromium.org
Cr-Commit-Position: refs/heads/main@{#1399398}