chore: Add & re-enable concurrency tests #3983

Job	Run time
apple (macos-14, Xcode_15.2, platform=iOS Simulator,OS=17.2,name=iPhone 15)	9m 56s
apple (macos-14, Xcode_15.2, platform=tvOS Simulator,OS=17.2,name=Apple TV 4K (3rd generation) (a...	7m 26s
linux (jammy, 5.9)	10m 6s
apple (macos-14, Xcode_15.2, platform=visionOS Simulator,OS=1.0,name=Apple Vision Pro)	13m 19s
linux (jammy, 6.0)	10m 5s
apple (macos-14, Xcode_15.2, platform=macOS)	8m 55s
apple (macos-15, Xcode_16.1, platform=iOS Simulator,OS=18.1,name=iPhone 16)	7m 19s
apple (macos-15, Xcode_16.1, platform=tvOS Simulator,OS=18.1,name=Apple TV 4K (3rd generation) (a...	6m 16s
linux (amazonlinux2, 5.9)	9m 41s
apple (macos-15, Xcode_16.1, platform=visionOS Simulator,OS=2.1,name=Apple Vision Pro)	8m 45s
apple (macos-15, Xcode_16.1, platform=macOS)	7m 52s
linux (amazonlinux2, 6.0)	9m 27s
	1h 49m 7s

Provide feedback