[WPT] Move credential-management/ FedCM tests to dedicated directory
This CL moves the remaining FedCM files in
wpt/credential-management/ to a dedicated FedCM directory.
BUG=347026221
Change-Id: I5509615b793a958061db6ddf8de75a267fe877ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5670976
Reviewed-by: Robert Flack flackr@chromium.org
Commit-Queue: Peter Kotwicz pkotwicz@chromium.org
Cr-Commit-Position: refs/heads/main@{#1324607}