Clean up WebAuthn javascript code and remove JQuery code (#22697)

There were several issues with the WebAuthn registration and testing
code and the style
was very old javascript with jquery callbacks.

This PR uses async and fetch to replace the JQuery code.

Ref #22651

Signed-off-by: Andrew Thornton <art27@cantab.net>

---------

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: silverwind <me@silverwind.io>

templates/user/settings/security/webauthn.tmpl

@@ -3,6 +3,7 @@
 </h4>
 <div class="ui attached segment">
 	<p>{{.locale.Tr "settings.webauthn_desc" | Str2html}}</p>
+	{{template "user/auth/webauthn_error" .}}
 	<div class="ui key list">
 		{{range .WebAuthnCredentials}}
 			<div class="item">
@@ -28,7 +29,6 @@
 	</div>
 </div>
 
-{{template "user/auth/webauthn_error" .}}
 
 <div class="ui g-modal-confirm delete modal" id="delete-registration">
 	<div class="header">