Add `x-test-features` and `format-feature-baseline` #1972

Job	Run time
json-schema	1m 3s
format	3m 37s
builds / build (windows-2022, windows-ci)	19m 4s
builds / build (ubuntu-20.04, linux-ci)	10m 3s
builds / build (macos-13, macos-ci)	13m 34s
	47m 21s

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