Clear orphan coverage objects #486

Job	Run time
build	2m 41s
clippy	2m 16s
fmt	11s
tests (coverage-point-calculator)	1m 24s
tests (ingest)	2m 0s
tests (coverage-map)	1m 43s
tests (reward-scheduler)	1m 3s
tests (task-manager)	1m 2s
tests-postgres (boost-manager)	2m 32s
tests-postgres (file-store)	2m 31s
tests-postgres (iot-config)	2m 46s
tests-postgres (iot-packet-verifier)	3m 42s
tests-postgres (iot-verifier)	2m 55s
tests-postgres (mobile-config)	2m 17s
tests-postgres (mobile-packet-verifier)	2m 52s
tests-postgres (mobile-verifier)	2m 50s
build-release	0s
	34m 45s

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