Build and test Sinch Node.js SDK

Improve CI performances - attempt 3 - cache build output only #245

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Run time

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Job	Run time
sonarcloud	1m 49s
build (18.x)	3m 34s
build (20.x)	3m 31s
e2e (18.x)	1m 23s
e2e (20.x)	1m 28s
	11m 45s