[wpt] upgrade saa tests to non-tentative
These are supported cross vendor:
https://privacycg.github.io/requestStorageAccessFor/
https://privacycg.github.io/storage-access/
Bug: 3534256
Change-Id: I9b9cace143baa4a6740cf2fad032e6ff9c814cea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5714249
Commit-Queue: Steven Bingler bingler@chromium.org
Auto-Submit: Ari Chivukula arichiv@chromium.org
Reviewed-by: Steven Bingler bingler@chromium.org
Cr-Commit-Position: refs/heads/main@{#1328261}