[Ban AI] Decommission Duo Features Enabled feature from Group and Admin Permission Settings

Context

We need to decommission the _duo_features_enabled.html.haml component in Group Settings > Edit via Permissions since there is a new Vue component and section to handle the updated functionality that was added in this MR.

Scope of this issue

• Remove _duo_features_enabled.html.haml component (and associated specs)
• Migrate DB changes to update column lock_duo_features_enabled to false when lock_duo_features_enabled is true AND when duo_features_enabled is also true