iOS Release requires template Podfile modification

[leotm]

Reverted

• Add iOS prod flag from RN 0.69.1->0.69.2 #791 (iOS CI blocked again)

Baked into React Native instead

• Bake prod env var into react_native_pods.rb for iOS Release build facebook/react-native#34234

For picking? in

• Road to 0.70.0 reactwg/react-native-releases#26

Unblock again

• iOS CI Release on macos-12 #690