Add `x-test-features` and `format-feature-baseline` #1887

Job	Run time
json-schema	1m 2s
format	3m 23s
builds / build (windows-2022, windows-ci)	7m 30s
builds / build (ubuntu-20.04, linux-ci)	5m 13s
builds / build (macos-13, macos-ci)	5m 58s
	23m 6s

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