Fix: Support metrics for Pods with multiple containers #11920

Job	Run time
unit tests on ubuntu-20.04	29m 51s
unit tests on ubuntu-20.04	29m 51s
integration tests on ubuntu-20.04	20m 44s
integration tests on ubuntu-20.04	25m 30s
integration tests on macos-11	32m 11s
integration tests on macos-11	32m 11s
integration tests on windows-2019	19m 26s
integration tests on windows-2019	19m 26s
	3h 29m 10s

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