Build and Test VSCode extension

Add unit tests for manual add project flow #951

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Run time

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Job	Run time
Test linux - gradle - previous	6h 0m 16s
Test linux - maven - previous	6h 0m 16s
Test linux - gradle - latest	12m 20s
Test mac - maven - previous	16m 19s
Test mac - maven - latest	9m 50s
Test mac - gradle - latest	15m 20s
Test mac - gradle - previous	14m 12s
Test linux - maven - latest	10m 33s
	13h 19m 6s