chore: Add & re-enable concurrency tests #3977

Job	Run time
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	11m 52s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	8m 57s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	11m 49s
apple (macos-14, Xcode_15.2, platform=macOS)	9m 40s
linux (jammy, 5.9)	9m 5s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	9m 27s
linux (jammy, 6.0)	9m 22s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	5m 57s
linux (amazonlinux2, 5.9)	14m 27s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	9m 42s
linux (amazonlinux2, 6.0)	9m 2s
apple (macos-15, Xcode_16.1, platform=macOS)	8m 20s
	1h 57m 40s

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