[chore][graph] Decompose buildConnector #23575

Job	Run time
govulncheck	30s
setup-environment	14s
checks	1m 50s
lint	3m 53s
cross-build-collector (darwin, amd64)	45s
test-coverage	6m 11s
cross-build-collector (darwin, arm64)	46s
unittest-matrix (ubuntu-latest, ~1.23)	2m 29s
cross-build-collector (linux, 386)	46s
unittest-matrix (ubuntu-latest, ~1.22)	2m 17s
cross-build-collector (linux, amd64)	46s
cross-build-collector (linux, arm64)	42s
cross-build-collector (linux, ppc64le)	43s
cross-build-collector (linux, arm, 7)	36s
cross-build-collector (linux, s390x)	44s
cross-build-collector (windows, 386)	45s
cross-build-collector (windows, amd64)	38s
unittest	1s
	24m 36s

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