Clear orphan coverage objects #463

Job	Run time
clippy	2m 3s
build	2m 44s
fmt	12s
tests (coverage-map)	1m 18s
tests (coverage-point-calculator)	1m 21s
tests (ingest)	2m 15s
tests (reward-scheduler)	51s
tests (task-manager)	53s
tests-postgres (boost-manager)	2m 37s
tests-postgres (file-store)	2m 13s
tests-postgres (iot-config)	2m 33s
tests-postgres (iot-packet-verifier)	3m 26s
tests-postgres (iot-verifier)	2m 34s
tests-postgres (mobile-config)	2m 19s
tests-postgres (mobile-packet-verifier)	2m 24s
tests-postgres (mobile-verifier)	3m 1s
build-release	0s
	32m 44s

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