[chore][codecov] Add code coverage to integration tests (#6146) #12906

Job	Run time
setup-environment	1m 20s
gofmt	4m 37s
generate-metrics	4m 37s
tidy	1m 49s
coverage	4m 35s
cross-compile (binaries-darwin_amd64)	4m 35s
lint	4m 36s
cross-compile (binaries-darwin_arm64)	4m 36s
test	4m 35s
cross-compile (binaries-linux_amd64)	4m 36s
cross-compile (binaries-linux_arm64)	4m 34s
cross-compile (binaries-windows_amd64)	4m 35s
cross-compile (binaries-linux_ppc64le)	4m 35s
	53m 40s

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