Add `x-test-features` and `format-feature-baseline` #1980

Job	Run time
format	3m 51s
json-schema	1m 3s
builds / build (windows-2022, windows-ci)	11m 53s
builds / build (ubuntu-20.04, linux-ci)	9m 47s
builds / build (macos-13, macos-ci)	11m 55s
	38m 29s

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