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Address TODOs, add deprecation warnings and remove as many U2F code references as possible.
Existing behavior is kept unaltered: it's still possible to inform Teleport of old U2F AppIDs and U2F configurations are still silently converted to WebAuthn. There's no reason to break that, so we don't.
Most server-side references to SecondFactorU2F are removed, but client-side references remain: this makes it possible to interop newer clients with old clusters (something else may break, but hopefully not this part).
Closes #10375.