Clear orphan coverage objects (#891) #502

Job	Run time
build	2m 19s
fmt	4s
clippy	2m 0s
tests (coverage-map)	1m 23s
tests (reward-scheduler)	1m 3s
tests (coverage-point-calculator)	1m 26s
tests (ingest)	2m 7s
tests (task-manager)	49s
tests-postgres (boost-manager)	2m 33s
tests-postgres (file-store)	2m 25s
tests-postgres (iot-config)	2m 25s
tests-postgres (iot-packet-verifier)	3m 22s
tests-postgres (iot-verifier)	2m 34s
tests-postgres (mobile-config)	2m 19s
tests-postgres (mobile-packet-verifier)	2m 21s
tests-postgres (mobile-verifier)	2m 43s
build-release	0s
	31m 53s

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