[pkg/stanza] container: move k8s metadata into resource attributes (#… #49

Job	Run time
windows-unittest-matrix (receiver-0)	18m 2s
windows-unittest-matrix (receiver-1)	17m 26s
windows-unittest-matrix (receiver-2)	20m 1s
windows-unittest-matrix (receiver-3)	22m 42s
windows-unittest-matrix (processor-0)	14m 23s
windows-unittest-matrix (processor-1)	15m 53s
windows-unittest-matrix (exporter-0)	14m 33s
windows-unittest-matrix (exporter-1)	23m 16s
windows-unittest-matrix (exporter-2)	21m 7s
windows-unittest-matrix (exporter-3)	16m 48s
windows-unittest-matrix (extension)	17m 35s
windows-unittest-matrix (connector)	14m 12s
windows-unittest-matrix (internal)	16m 14s
windows-unittest-matrix (pkg)	14m 4s
windows-unittest-matrix (cmd-0)	25m 11s
windows-unittest-matrix (cmd-1)	21m 6s
windows-unittest-matrix (other)	25m 30s
windows-unittest	0s
	5h 18m 3s

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