Draft: Remove `webauthn_without_totp` feature flag
What does this MR do and why?
We deemed the webauthn_without_totp
feature flag safe after it was
rollout for Gitlab.com. See:
#386270 (closed)
Now we enable this new feature by default and delete the feature flag.
Closes #396931
Changelog: changed
Screenshots or screen recordings
N/A
How to set up and validate locally
N/A
MR acceptance checklist
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