Change u2f_registrations example for console
What does this MR do and why?
It updates rails console example and changes the u2f_registrations
table to webauthn_registrations
because we removed the u2f_registrations
table in https://gitlab.com/gitlab-org/gitlab/-/blob/291007-identity-provider-fix/db/post_migrate/20230314094215_drop_u2f_registrations_table.rb
MR acceptance checklist
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