Database Integration tests on tvOS

[DellaBitta]

integration_test XCode project update to support tvOS.

• added a tvOS target to the project.
• updated Podfile to include tvOS pods.

To test:

• cp your GoogleService-Info.plist to the database\integration_test directory.
• run pod install from database\integration_test. If you encounter errors run pod repo update and then attempt the pod install again.
• open integration_test.xcworkspace
• Drag and drop firebase.xcframework, firebase_auth.xcframework and firebase_firestore.xcframework with tvOS support intoFrameworks.

All tests pass on simulator.

[vimanyu]

This was failing while testing on device. Some changes we can make to improve the experience,

• Pre-add Foundation.framework, UIKit.framework, CoreGraphics.framework just like the ios target
• Add "GoogleService-Info.plist" in Copy Bundle Resources (without this, the application will not run via batch)
• Removed "Embedded frameworks" as they were causing an installation error.