Add basic Electron tests and pump its version for demos #214

Job	Run time
build-and-test / build (16.X, arm64, jazzy)	7m 6s
build-and-test / build (16.X, arm64, kilted)	4m 41s
build-and-test / build (16.X, arm64, humble)	7m 45s
	19m 32s

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