Bug 1875565 [wpt PR 44097] - [FedCM] Check response code in Error API, a=testonly

Bug 1875565 [wpt PR 44097] - [FedCM] Check response code in Error API, a=testonly

Automatic update from web-platform-tests
[FedCM] Check response code in Error API

If an IdP returns unparsable response in the id assertion endpoint,
currently we treat it as a server error. Rather, we should only proceed
with server error if the response code is 500 or the IdP explicitly
uses "server_error" in the Error API.

Bug: 1519671
Change-Id: Ia671c25fdfc17763418b0ea29004137f2413e700
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5214925
Auto-Submit: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Zachary Tan <tanzachary@chromium.org>
Commit-Queue: Zachary Tan <tanzachary@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1249557}

--

wpt-commits: 0ab8387901f7ea14a42ae6d740b8904b0bf1f499
wpt-pr: 44097