Remove ff and policy information

What does this MR do and why?

Remove ff and policy information related to auto_fix.

Follow up from Remove frontend code for security_auto_fix with... (!147078 - merged) • Zamir Martins • 16.11.

Related issue: [Feature flag] Cleanup security_auto_fix (#435432 - closed) • Zamir Martins • 17.0 • Needs attention

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