Add singleton flags to factories and standardize attributes #31133

Job	Run time
contrib-tests-matrix (receiver-0)	6m 48s
contrib-tests-matrix (receiver-1)	8m 22s
contrib-tests-matrix (receiver-2)	8m 59s
contrib-tests-matrix (receiver-3)	7m 43s
contrib-tests-matrix (processor)	7m 6s
contrib-tests-matrix (exporter-0)	3m 28s
contrib-tests-matrix (exporter-1)	10m 13s
contrib-tests-matrix (extension)	6m 47s
contrib-tests-matrix (connector)	5m 5s
contrib-tests-matrix (internal)	7m 52s
contrib-tests-matrix (pkg)	4m 9s
contrib-tests-matrix (cmd-0)	49s
contrib-tests-matrix (cmd-1)	1m 30s
contrib-tests-matrix (other)	4m 24s
contrib_tests	4s
	1h 23m 19s

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