chore: Add & re-enable concurrency tests #3973

Job	Run time
linux (jammy, 5.9)	6m 46s
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	5m 38s
linux (jammy, 6.0)	7m 2s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	3m 53s
linux (amazonlinux2, 5.9)	7m 18s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	5m 33s
linux (amazonlinux2, 6.0)	7m 27s
apple (macos-14, Xcode_15.2, platform=macOS)	7m 18s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	3m 48s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	3m 36s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	3m 38s
apple (macos-15, Xcode_16.1, platform=macOS)	6m 30s
	1h 8m 27s

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