Backport of https://github.com/go-gitea/gitea/pull/36219
Fixes: https://github.com/go-gitea/gitea/issues/36216
Now `detectWebAuthnSupport` returns the error type and lets the caller
decide whether they call `webAuthnError` and show the error. It no
longer shows the error during page load when the user has not even
interacted with the feature.
The bug affects all users on HTTP, so I think a quick fix release for
this might be good.
None of the frontend js/ts files was touched besides these two commands
(edit: no longer true, I touched one file in
61105d0618
because of a deprecation that was not showing before the rename).
`tsc` currently reports 778 errors, so I have disabled it in CI as
planned.
Everything appears to work fine.
