Fix Performance unit tests on Xcode 15

[paulb777]

Description

The Performance unit tests should run from Xcode 15

Reproducing the issue

bundle exec pod gen FirebasePerformance.podspec --auto-open --local-sources=./ --platforms=ios
Select the unit test scheme and tes:

Firebase SDK Version

10.16.0

Xcode Version

15

Installation Method

CocoaPods

Firebase Product(s)

Performance

Targeted Platforms

iOS

Relevant Log Output

No response

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

Expand Package.resolved snippet

Replace this line with the contents of your Package.resolved.

If using CocoaPods, the project's Podfile.lock

Expand Podfile.lock snippet

Replace this line with the contents of your Podfile.lock!

[paulb777]

Interestingly, only one test fails running via SPM:

-[FPRObjectInstrumentorTest testCopySelectorFromClassThatModifies]

[paulb777]

Also GCDWebServer needs to be removed or have its minimum iOS version updated.

[ncooke3]

Also GCDWebServer needs to be removed or have its minimum iOS version updated.

Could we stage a modified version of the pod on SpecStaging?

[paulb777]

That's a good idea, at least for a workaround - since we don't necessarily need to support our customers using testspecs.

[paulb777]

With firebase/SpecsStaging@3cfca36, I get a successful build, but still see 48 test failures: