[Infra] Migrate away from macos-12 in performance.yml

[ncooke3]

Related to #11903

#no-changelog

[ncooke3]

Edit: I think #11903 is still valid because pod gen locally reveals the failures, but it's weird that the tests passed on CI...

[ncooke3]

Hmm, looks like xcbeautify doesn't surface a failing exit code when tests crash (cpisciotta/xcbeautify#175):

https://github.com/firebase/firebase-ios-sdk/actions/runs/11862154195/job/33061011258?pr=14131#step:6:893

[andrewheard]

Hmm, looks like xcbeautify doesn't surface a failing exit code when tests crash

This was a good catch. Let's investigate what to do next before merging.

[andrewheard]

Although this doesn't fully resolve #11903, moving off of macos-12 will soon be important and the jobs that are changed in this PR (see below) are passing on CI.

firebase-ios-sdk/scripts/build.sh

Lines 637 to 660 in d84d5ef

	Performance-*-unit)
	# Run unit tests on prod environment with unswizzle capabilities.
	export FPR_UNSWIZZLE_AVAILABLE="1"
	export FPR_AUTOPUSH_ENV="0"
	pod_gen FirebasePerformance.podspec --platforms="${gen_platform}"
	RunXcodebuild \
	-workspace 'gen/FirebasePerformance/FirebasePerformance.xcworkspace' \
	-scheme "FirebasePerformance-Unit-unit" \
	"${xcb_flags[@]}" \
	build \
	test
	;;
	Performance-*-proddev)
	# Build the prod dev test app.
	export FPR_UNSWIZZLE_AVAILABLE="0"
	export FPR_AUTOPUSH_ENV="0"
	pod_gen FirebasePerformance.podspec --platforms="${gen_platform}"
	RunXcodebuild \
	-workspace 'gen/FirebasePerformance/FirebasePerformance.xcworkspace' \
	-scheme "FirebasePerformance-TestApp" \
	"${xcb_flags[@]}" \
	build
	;;

Unlike the spm jobs, the ones touched in this PR don't appear to be crashing:

• performance (iOS, unit)
• performance (iOS, proddev) (build only)
• performance (tvOS, unit)
• performance (tvOS, proddev) (build only)