Address Firebase Performance issues with Xcode 15

[paulb777]

Description

In the Xcode 15 beta0, FirebasePerformance has two build warnings:

One unit test failure:

and one unit test crash in testCopySelectorFromClassThatModifies:

Reproducing the issue

Build and run unit tests with Xcode 15 beta0

Firebase SDK Version

10.11.0

Xcode Version

15.0-beta

Installation Method

Swift Package Manager

Firebase Product(s)

Performance

Targeted Platforms

iOS

Relevant Log Output

No response

If using Swift Package Manager, the project's Package.resolved

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If using CocoaPods, the project's Podfile.lock

Expand Podfile.lock snippet

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