Build and Test VSCode extension

Update GHA to run with JDK21 #62

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Run time

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Job	Run time
Test linux - gradle - previous	7m 56s
Test linux - gradle - latest	7m 37s
Test linux - maven - latest	10m 5s
Test mac - maven - previous	12m 13s
Test mac - gradle - previous	6m 48s
Test linux - maven - previous	9m 27s
Test mac - gradle - latest	8m 22s
Test mac - maven - latest	11m 15s
	1h 13m 43s