chore(feedback): Remove Seer spam detection feature flag (#102411)

closes REPLAY-651

depends on
getsentry/sentry-options-automator#5590 (merged)

Seer spam detection is GA'd at 100%. Let's remove the unused feature
flag.

Author: srest2021

src/sentry/features/temporary.py

@@ -490,8 +490,6 @@ def register_temporary_features(manager: FeatureManager) -> None:
     manager.add("organizations:user-feedback-ai-titles", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enable auto spam classification at User Feedback ingest time
     manager.add("organizations:user-feedback-spam-ingest", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
-    # Enable rerouting of auto spam classification at User Feedback ingest time to Seer
-    manager.add("organizations:user-feedback-seer-spam-detection", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=False)
     # Enable User Feedback v2 UI
     manager.add("organizations:user-feedback-ui", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enable view hierarchies options