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Use `markdownlint` instead of `mdformat` #2782

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Run time

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Job	Run time
lint-and-test (3.8)	10m 36s
lint-and-test (3.9)	10m 28s
lint-and-test (3.10)	10m 24s
lint-and-test (3.11)	10m 59s
	42m 27s