Aggregator: publish diagnostics_toplevel_state immediately on every degradation #478

Job	Run time
diagnostic_aggregator on humble	3m 46s
diagnostic_aggregator on iron	4m 6s
diagnostic_aggregator on rolling	5m 1s
diagnostic_common_diagnostics on humble	3m 51s
diagnostic_common_diagnostics on iron	3m 26s
diagnostic_common_diagnostics on rolling	3m 35s
diagnostic_updater on humble	3m 30s
diagnostic_updater on iron	4m 10s
diagnostic_updater on rolling	4m 0s
self_test on humble	4m 9s
self_test on iron	4m 1s
self_test on rolling	3m 45s
	47m 20s

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