Fill out `layoutSystemForChildren` in `fixSpyOnlyMetadata` #10841

Job	Run time
Install everything with PNPM and cache it / Install everything with PNPM and cache it	3m 50s
Test Editor PR – TypeScript, ESLint, dependency-cruiser	7m 38s
Deploy Staging Editor	5m 51s
Test Editor PR – Jest tests	11m 56s
Test Editor Shard 2 / Test Editor PR – Karma tests (Shard 2)	11m 10s
Test Editor Shard 1 / Test Editor PR – Karma tests (Shard 1)	13m 55s
Run System Tests	3m 21s
Run Performance Tests	8m 35s
	1h 6m 16s

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