[chore][mdatagen] fix imports conditions and indentation (#12797) #29636

Job	Run time
govulncheck	36s
setup-environment	11s
unittest-matrix (ubuntu-latest, ~1.24)	2m 35s
checks	2m 25s
unittest-matrix (ubuntu-latest, ~1.23)	2m 21s
lint	4m 54s
cross-build-collector (aix, ppc64)	48s
test-coverage	8m 11s
cross-build-collector (darwin, amd64)	43s
cross-build-collector (darwin, arm64)	46s
cross-build-collector (linux, 386)	42s
cross-build-collector (linux, amd64)	44s
cross-build-collector (linux, arm64)	47s
cross-build-collector (linux, ppc64le)	51s
cross-build-collector (linux, arm, 7)	52s
cross-build-collector (linux, s390x)	40s
cross-build-collector (windows, 386)	43s
cross-build-collector (windows, amd64)	43s
unittest	1s
	29m 33s

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