Added Unit tests for Container insights metrics (#140) #575

Job	Run time
windows-unittest-matrix (receiver-0)	8m 56s
windows-unittest-matrix (receiver-1)	8m 59s
windows-unittest-matrix (processor)	8m 51s
windows-unittest-matrix (exporter)	9m 4s
windows-unittest-matrix (extension)	9m 5s
windows-unittest-matrix (internal)	9m 4s
windows-unittest-matrix (pkg)	8m 59s
windows-unittest-matrix (cmd)	9m 2s
windows-unittest-matrix (other)	9m 1s
windows-unittest	0s
	1h 21m 1s

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