[chore][graph] Decompose buildConnector #23570

Job	Run time
govulncheck	28s
setup-environment	9s
checks	2m 2s
unittest-matrix (ubuntu-latest, ~1.23)	2m 32s
unittest-matrix (ubuntu-latest, ~1.22)	2m 24s
lint	3m 53s
cross-build-collector (darwin, amd64)	40s
cross-build-collector (darwin, arm64)	40s
test-coverage	6m 19s
cross-build-collector (linux, 386)	36s
cross-build-collector (linux, amd64)	44s
cross-build-collector (linux, arm64)	44s
cross-build-collector (linux, ppc64le)	48s
cross-build-collector (linux, arm, 7)	36s
cross-build-collector (linux, s390x)	40s
cross-build-collector (windows, 386)	42s
cross-build-collector (windows, amd64)	49s
unittest	1s
	24m 47s

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