Use elevate for adding and deleting passkeys

[frjo]

Also sending e-mail notifications when user add or delete a passkey. Made the default elevate cookie time 15 minuts instead of 60 minuts.

Test Steps

• Confirm that elevate privilege is requested when adding or deleting passkeys when more than 15 minuts passed since last authentication.
• Confirm that adding and deleting passkeys works as before in other regard.
• Check that e-mail notifications are sent when adding or deleting a passkey.