chore: Add & re-enable concurrency tests #3981

Job	Run time
linux (jammy, 5.9)	9m 14s
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	12m 37s
linux (jammy, 6.0)	9m 6s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	7m 28s
linux (amazonlinux2, 5.9)	9m 36s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	9m 51s
linux (amazonlinux2, 6.0)	8m 55s
apple (macos-14, Xcode_15.2, platform=macOS)	10m 14s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	11m 33s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	7m 22s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	13m 0s
apple (macos-15, Xcode_16.1, platform=macOS)	9m 49s
	1h 58m 45s

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