cmd/mdatagen: introduce additional metadata for deprecated metrics #36618

Job	Run time
setup-environment	17s
test-coverage	7m 52s
checks	1m 29s
lint	14m 44s
govulncheck	3m 16s
unittest-matrix (ubuntu-latest, oldstable)	1m 25s
unittest-matrix (ubuntu-latest, stable)	1m 29s
cross-build-collector (linux, 386)	52s
cross-build-collector (aix, ppc64)	48s
cross-build-collector (linux, arm64)	51s
cross-build-collector (linux, ppc64le)	50s
cross-build-collector (linux, amd64)	55s
cross-build-collector (darwin, arm64)	56s
cross-build-collector (darwin, amd64)	57s
cross-build-collector (linux, s390x)	54s
cross-build-collector (windows, 386)	49s
cross-build-collector (linux, riscv64)	57s
cross-build-collector (linux, arm, 7)	53s
cross-build-collector (windows, arm64)	52s
cross-build-collector (windows, amd64)	50s
unittest	4s
	42m 0s

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