chore: Add & re-enable concurrency tests #3974

Job	Run time
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	10m 10s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	11m 24s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	34m 54s
apple (macos-14, Xcode_15.2, platform=macOS)	14m 39s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	8m 26s
linux (jammy, 5.9)	9m 19s
linux (jammy, 6.0)	8m 46s
linux (amazonlinux2, 5.9)	9m 23s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	7m 42s
linux (amazonlinux2, 6.0)	9m 30s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	6m 39s
apple (macos-15, Xcode_16.1, platform=macOS)	7m 56s
	2h 18m 48s

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