xk6

Refactor `new` command #6545

Job	Run time
test-xk6 (stable, ubuntu-latest)	1m 6s
test-xk6 (stable, windows-latest)	5m 24s
test-xk6 (stable, macos-latest)	1m 2s
test-xk6 (tip, ubuntu-latest)	1m 13s
test-xk6 (tip, windows-latest)	3m 47s
test-xk6 (tip, macos-latest)	1m 14s
	13m 46s

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