admin/migrate: Simplify `HarnessWithOutput` creation #20655

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Run time

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Job	Run time
Changed Files	18s
Backend / Test	43s
Backend / Lint	2m 12s
Frontend / Lint	0s
Backend / cargo-deny	0s
Frontend / Percy Nonce	0s
Frontend / Test	0s
Frontend / Test (playwright)	0s
	3m 13s