Add `x-test-features` and `format-feature-baseline` #1976

Job	Run time
format	2m 39s
json-schema	58s
builds / build (windows-2022, windows-ci)	4m 56s
builds / build (ubuntu-20.04, linux-ci)	3m 38s
builds / build (macos-13, macos-ci)	3m 28s
	15m 39s

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