chore: Add & re-enable concurrency tests #3978

Job	Run time
linux (jammy, 5.9)	9m 45s
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	10m 20s
linux (jammy, 6.0)	9m 3s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	7m 32s
linux (amazonlinux2, 5.9)	9m 37s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	11m 23s
linux (amazonlinux2, 6.0)	9m 22s
apple (macos-14, Xcode_15.2, platform=macOS)	10m 11s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	8m 51s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	6m 21s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	6m 50s
apple (macos-15, Xcode_16.1, platform=macOS)	8m 5s
	1h 47m 20s

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