Partial Backport #22651
This PR fixes a longstanding bug within webauthn due to the backend
using URLEncodedBase64 but the javascript using decoding using plain
base64. This causes intermittent issues with users reporting decoding
errors.
Fix#22507
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>