cmd/mdatagen: introduce additional metadata for deprecated metrics #36676

Job	Run time
setup-environment	20s
unittest-matrix (ubuntu-latest, oldstable)	6m 52s
govulncheck	3m 17s
checks	2m 32s
unittest-matrix (ubuntu-latest, stable)	6m 55s
test-coverage	11m 55s
lint	15m 8s
cross-build-collector (linux, arm64)	57s
cross-build-collector (aix, ppc64)	59s
cross-build-collector (linux, amd64)	55s
cross-build-collector (linux, s390x)	55s
cross-build-collector (darwin, amd64)	1m 2s
cross-build-collector (windows, arm64)	54s
cross-build-collector (windows, amd64)	58s
cross-build-collector (linux, arm, 7)	55s
cross-build-collector (windows, 386)	56s
cross-build-collector (linux, riscv64)	1m 3s
cross-build-collector (darwin, arm64)	56s
cross-build-collector (linux, 386)	53s
cross-build-collector (linux, ppc64le)	55s
unittest	3s
	59m 20s

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