chore(insights): Delete unused webvital flags from temporary.py (#74511)

Deletes:
`organizations:insights-browser-webvitals-static-weights`
`organizations:insights-browser-webvitals-optional-components`
`organizations:insights-default-performance-score-profiles`

Author: edwardgou-sentry

src/sentry/features/temporary.py

@@ -422,12 +422,6 @@ def register_temporary_features(manager: FeatureManager):
     manager.add("organizations:insights-initial-modules", OrganizationFeature, FeatureHandlerStrategy.INTERNAL, api_expose=True)
     # Enable access to newer Insights modules (Caches, Queues, LLMs, Mobile UI)
     manager.add("organizations:insights-addon-modules", OrganizationFeature, FeatureHandlerStrategy.INTERNAL, api_expose=True)
-    # Use static web vital performance scoring weights
-    manager.add("organizations:insights-browser-webvitals-static-weights", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
-    # Sets all web vitals to optional when calculating performance scores
-    manager.add("organizations:insights-browser-webvitals-optional-components", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=False)
-    # Add default browser performance score profile for fallback when no or unknown browser name is provided
-    manager.add("organizations:insights-default-performance-score-profiles", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=False)
     # Enable standalone span ingestion
     manager.add("organizations:standalone-span-ingestion", OrganizationFeature, FeatureHandlerStrategy.INTERNAL, api_expose=False)
     # Enable the aggregate span waterfall view