Tests

Drop the yarn and nvm installation support #726

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Run time

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Job	Run time
test-main	1m 52s
test-main	4m 43s
test-02-raft	0s
test-02-raft	4m 35s
test-04-snapshot	0s
test-04-snapshot	3m 42s
test-03-private-data	0s
test-03-private-data	1m 18s
test-k8	0s
test-k8	2m 37s
	18m 47s