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feat(unstable/fmt): move yaml formatting behind unstable flag #56934

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Job	Run time
pre-build	2s
test debug macos-x86_64	27m 14s
test release macos-x86_64	4s
test debug macos-aarch64	19m 4s
test release macos-aarch64	5s
test debug windows-x86_64	35m 25s
test release windows-x86_64	5s
test release linux-x86_64	33m 47s
bench release linux-x86_64	4s
test debug linux-x86_64	33m 22s
lint debug linux-x86_64	5m 54s
test debug linux-aarch64	11m 8s
test release linux-aarch64	23m 29s
lint debug macos-x86_64	11m 27s
lint debug windows-x86_64	17m 24s
publish canary	0s
	3h 38m 34s