[chore] Simplify discovery integration tests #10978

Job	Run time
setup-environment	1m 49s
coverage	8m 0s
gofmt	4m 28s
cross-compile (binaries-darwin_amd64)	4m 30s
generate-metrics	4m 27s
cross-compile (binaries-darwin_arm64)	4m 35s
test	13m 59s
lint	13m 15s
cross-compile (binaries-linux_amd64)	4m 25s
cross-compile (binaries-linux_arm64)	4m 21s
tidy	1m 13s
cross-compile (binaries-windows_amd64)	4m 44s
cross-compile (binaries-linux_ppc64le)	4m 15s
	1h 14m 1s

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