[mdatagen] copy files from contrib to core #16390

Job	Run time
govulncheck	29s
setup-environment	13s
test-coverage	2m 22s
unittest-matrix (~1.21.5)	1m 20s
unittest-matrix (~1.20.12)	1m 12s
checks	29s
lint	3m 9s
cross-build-collector (darwin, amd64)	36s
cross-build-collector (darwin, arm64)	36s
cross-build-collector (linux, 386)	39s
cross-build-collector (linux, amd64)	40s
cross-build-collector (linux, arm64)	40s
cross-build-collector (linux, ppc64le)	34s
cross-build-collector (linux, arm, 7)	39s
cross-build-collector (linux, s390x)	41s
cross-build-collector (windows, 386)	40s
cross-build-collector (windows, amd64)	36s
unittest	1s
	15m 36s

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