[AppCheck] App Attest provider is supported by tvOS 15.0+ #10093
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This PR is part of a series of PRs to cleanup App Check's availability guards.
#10094 focused on fixing AppCheck's watchOS CI and watchOS x DeviceCheck availability. This PR focuses on tvOS availability improvements as well as cleaning up some outdated logic.
I thought using the split view on this PR made it easier to understand the diff.
Context
This PR achieves two things:
FIRAppCheckAvailability.h
was created, I believe we were still supporting Xcode 12. Since Xcode 12.5 expanded availability for AppAttest, the availability logic was tailored to enable API based on Xcode version (since we had to support developers using minor versions before and after Xcode 12.5).Since we no longer support Xcode 12, we can simplify things by removing this.