feat(replay): Remove flag replay-details-new-ui

The new design changes werent that major so we are removing this flag. (usage was removed in #104246)

Author: billyvg

src/sentry/features/temporary.py

@@ -426,8 +426,6 @@ def register_temporary_features(manager: FeatureManager) -> None:
     manager.add("organizations:session-replay-slack-new-issue", OrganizationFeature, FeatureHandlerStrategy.INTERNAL, api_expose=False)
     # Enable core Session Replay link in the sidebar
     manager.add("organizations:session-replay-ui", OrganizationFeature, FeatureHandlerStrategy.INTERNAL, default=True, api_expose=True)
-    # Enable new UI for replay details page
-    manager.add("organizations:replay-details-new-ui", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enable playlist view in replay details page
     manager.add("organizations:replay-playlist-view", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enable the rendering of @sentry/toolbar inside the sentry app. See `useInitSentryToolbar()`