Add `x-test-features` and `format-feature-baseline` #1983

Job	Run time
json-schema	1m 0s
format	3m 15s
builds / build (windows-2022, windows-ci)	20m 17s
builds / build (ubuntu-20.04, linux-ci)	10m 1s
builds / build (macos-13, macos-ci)	15m 34s
	50m 7s

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