ROS2 port of feature to report stale when no errors but stale items #65

Job	Run time
diagnostic_aggregator on humble	3m 29s
diagnostic_aggregator on iron	4m 11s
diagnostic_aggregator on rolling	2m 49s
diagnostic_common_diagnostics on humble	3m 23s
diagnostic_common_diagnostics on iron	3m 57s
diagnostic_common_diagnostics on rolling	1m 53s
diagnostic_updater on humble	3m 33s
diagnostic_updater on iron	3m 10s
diagnostic_updater on rolling	2m 31s
self_test on humble	3m 43s
self_test on iron	3m 44s
self_test on rolling	1m 57s
	38m 20s

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