xk6

Refactor `new` command #6544

Job	Run time
test-xk6 (stable, ubuntu-latest)	1m 42s
test-xk6 (stable, windows-latest)	4m 15s
test-xk6 (stable, macos-latest)	1m 27s
test-xk6 (tip, ubuntu-latest)	1m 45s
test-xk6 (tip, windows-latest)	3m 42s
test-xk6 (tip, macos-latest)	1m 56s
	14m 47s

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