Feedback-related telemetry and prompts now respect allow_product_feedback

What

• The tengu_session_memory_rated event, sent when a user marks a remembered session-memory entry as good or bad, is now only sent when the allow_product_feedback setting is true.
• The interactive feedback-prompt UI now checks allow_product_feedback before doing anything besides letting the prompt be dismissed, closing the prompt immediately when it's off.

Why

This matches org policy for accounts under ZDR/HIPAA-style restrictions, which suppresses feedback-derived telemetry and UI so those organizations' feedback data isn't collected when their policy disallows it.