[Firebase AI] Remove placeholder Firebase folder for zip frameworks #1773 
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This is a partial revert of #1772. We don't need the placeholder
Firebasefolder and references because https://github.com/firebase/quickstart-ios/blob/fe0b2640e883054647f16083aa835bf6388d7071/scripts/add_framework_script.rb adds them. This resulted inerror: Unexpected duplicate tasks.The
#if canImport(FirebaseAILogic)parts of #1772 are still necessary and have not been reverted.