Add basic Electron tests and pump its version for demos #212

Job	Run time
build-and-test / build (16.X, arm64, jazzy)	8m 52s
build-and-test / build (16.X, arm64, kilted)	10m 16s
build-and-test / build (16.X, arm64, humble)	7m 30s
	26m 38s

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