cmd/mdatagen: introduce additional metadata for deprecated metrics #36654

Job	Run time
setup-environment	17s
govulncheck	3m 24s
lint	14m 50s
unittest-matrix (ubuntu-latest, stable)	6m 55s
test-coverage	11m 30s
unittest-matrix (ubuntu-latest, oldstable)	8m 51s
checks	2m 23s
cross-build-collector (linux, amd64)	53s
cross-build-collector (darwin, amd64)	56s
cross-build-collector (linux, riscv64)	1m 4s
cross-build-collector (linux, ppc64le)	1m 1s
cross-build-collector (linux, 386)	52s
cross-build-collector (darwin, arm64)	58s
cross-build-collector (aix, ppc64)	1m 3s
cross-build-collector (linux, arm, 7)	55s
cross-build-collector (windows, arm64)	1m 3s
cross-build-collector (windows, 386)	1m 0s
cross-build-collector (linux, arm64)	54s
cross-build-collector (windows, amd64)	1m 3s
cross-build-collector (linux, s390x)	1m 0s
unittest	4s
	1h 0m 56s

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