[chore][config/configopaque] Move implementation checks to test files… #1

Job	Run time
setup-environment	33s
govulncheck	1m 6s
checks	1m 58s
test-coverage	6m 48s
lint	3m 17s
unittest-matrix (~1.21.5)	4m 48s
unittest-matrix (~1.20.12)	3m 52s
cross-build-collector (darwin, amd64)	44s
cross-build-collector (darwin, arm64)	43s
cross-build-collector (linux, 386)	37s
cross-build-collector (linux, amd64)	46s
cross-build-collector (linux, arm64)	45s
cross-build-collector (linux, ppc64le)	39s
cross-build-collector (linux, arm, 7)	38s
cross-build-collector (linux, s390x)	38s
cross-build-collector (windows, 386)	46s
cross-build-collector (windows, amd64)	42s
unittest	1s
	29m 21s

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