Build and Test VSCode extension

Bump LCLS version to 2.3.1 and handle new Maven Central endpoints #752

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Run time

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Job	Run time
Build Plugin (linux, previous)	6m 23s
Build Plugin (linux, latest)	6m 32s
Build Plugin (mac, latest)	1s
Build Plugin (mac, previous)	1s
Build Plugin (mac, previous)	7m 46s
Build Plugin (mac, latest)	7m 53s
Build Plugin (linux, previous)	7m 18s
Build Plugin (linux, latest)	6m 35s
	42m 29s