xk6

Refactor `new` command #6543

Job	Run time
test-xk6 (stable, ubuntu-latest)	1m 11s
test-xk6 (stable, windows-latest)	5m 3s
test-xk6 (stable, macos-latest)	58s
test-xk6 (tip, ubuntu-latest)	1m 10s
test-xk6 (tip, windows-latest)	2m 25s
test-xk6 (tip, macos-latest)	1m 27s
	12m 14s

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