[Sessions] Fix test app crash

[ncooke3]

Fixes runtime exception: SwiftUI/App.swift:132: Fatal error: apps must be value types; AppQualityDevAppApp is a class.

This exception was obscured in this failing log: https://github.com/firebase/firebase-ios-sdk/actions/runs/14370249342/job/40291840387?pr=14698

#no-changelog

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[paulb777]

Thanks! Will you add an explanation of the fix in the PR?