Use direct_connection in mongodb discovery #12558

Job	Run time
setup-environment	1m 20s
lint	11m 25s
gofmt	5m 33s
tidy	1m 56s
test	16m 19s
coverage	9m 23s
cross-compile (binaries-darwin_amd64)	5m 5s
generate-metrics	5m 33s
cross-compile (binaries-darwin_arm64)	5m 9s
cross-compile (binaries-linux_amd64)	5m 14s
cross-compile (binaries-linux_arm64)	4m 52s
cross-compile (binaries-windows_amd64)	4m 54s
cross-compile (binaries-linux_ppc64le)	4m 56s
	1h 21m 39s

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