FLEDGE: Add WPT for high-level problems with serverResponse payload
In particular error injection at various layers and failing to
find/authorize the response.
Change-Id: Id6d77d7866ab7acf4d1c2fef5cb637c7f0a8065a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5850614
Reviewed-by: Russ Hamilton behamilton@google.com
Commit-Queue: Maks Orlovich morlovich@chromium.org
Cr-Commit-Position: refs/heads/main@{#1353884}