chore: Add & re-enable concurrency tests #1272

Job	Run time
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	10m 7s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	9m 26s
linux (jammy, 5.9)	11m 25s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	11m 19s
linux (jammy, 6.0)	11m 31s
apple (macos-14, Xcode_15.2, platform=macOS)	8m 37s
linux (amazonlinux2, 5.9)	11m 22s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	9m 38s
linux (amazonlinux2, 6.0)	11m 46s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	9m 27s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	10m 5s
apple (macos-15, Xcode_16.1, platform=macOS)	8m 46s
	2h 3m 29s

Provide feedback