cmd/mdatagen: introduce additional metadata for deprecated metrics #32303

Job	Run time
windows-unittest (windows-2022)	15m 41s
windows-unittest (windows-2025)	18m 51s
windows-service-test (windows-11-arm)	3m 36s
windows-service-test (windows-2025)	2m 52s
windows-service-test (windows-2022)	2m 58s
windows-unittest (windows-11-arm)	11m 13s
	55m 11s

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