Add e2e signalling tests #4195

Job	Run time
Build (aarch64-apple-darwin)	15m 22s
Build (aarch64-linux-android)	7m 14s
Build (x86_64-unknown-linux-gnu)	9m 33s
Build (x86_64-apple-darwin)	7m 45s
Build (x86_64-linux-android)	7m 7s
Build (aarch64-pc-windows-msvc)	13m 8s
Build (aarch64-apple-ios-sim)	7m 12s
Build (aarch64-unknown-linux-gnu)	6m 41s
Build (armv7-linux-androideabi)	7m 0s
Build (x86_64-pc-windows-msvc)	16m 6s
Build (aarch64-apple-ios)	9m 16s
	1h 46m 24s

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