ref: Revert temporary.py change, split into separate PR

Agent transcript: https://claudescope.sentry.dev/share/7wGbLrKiB2lIlectbjlUshpfOeBY8wdz6GFT_T4xGfY

Author: chromy

src/sentry/features/temporary.py

@@ -245,6 +245,8 @@ def register_temporary_features(manager: FeatureManager) -> None:
     manager.add("organizations:preprod-enforce-size-quota", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=False)
     # Enable enforcement of preprod distribution quota checks (when disabled, distribution quota checks always return True)
     manager.add("organizations:preprod-enforce-distribution-quota", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=False)
+    # Enable preprod size monitors frontend
+    manager.add("organizations:preprod-size-monitors-frontend", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enable preprod snapshots product feature
     manager.add("organizations:preprod-snapshots", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enables PR page