[chore][memcachedreceiver] Add stability level per metric #42273

Job	Run time
setup-environment	1m 43s
arm-unittest-matrix (exporter-0)	3m 23s
arm-unittest-matrix (processor-0)	3m 50s
arm-unittest-matrix (receiver-3)	7m 19s
arm-unittest-matrix (exporter-1)	9m 44s
arm-unittest-matrix (processor-1)	4m 31s
arm-unittest-matrix (receiver-0)	5m 44s
arm-unittest-matrix (exporter-2)	3m 49s
arm-unittest-matrix (receiver-2)	8m 58s
arm-unittest-matrix (receiver-1)	7m 53s
arm-unittest-matrix (internal)	8m 14s
arm-unittest-matrix (other)	4m 39s
arm-unittest-matrix (pkg)	6m 41s
arm-unittest-matrix (cmd-0)	2m 29s
arm-unittest-matrix (exporter-3)	6m 41s
arm-unittest-matrix (extension)	8m 11s
arm-unittest-matrix (connector)	4m 36s
arm-unittest	4s
flakytests-generate-issues	0s
	1h 38m 29s

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