test: improve code coverage reporting + codecov #2404

Job	Run time
dependencies (linux, gcc, Debug)	1m 16s
dependencies (linux, gcc, Release)	1m 13s
dependencies (linux, clang, Debug)	1m 25s
dependencies (linux, clang, Release)	1m 17s
coverage (linux, gcc, Debug)	13m 50s
test (linux, gcc, Debug)	11m 39s
test (linux, gcc, Debug, -Dunity=ON)	6m 54s
test (linux, gcc, Release)	15m 44s
test (linux, gcc, Release, -Dunity=ON)	8m 35s
test (linux, clang, Debug)	9m 19s
test (linux, clang, Debug, -Dunity=ON)	5m 38s
test (linux, clang, Release)	12m 31s
test (linux, clang, Release, -Dunity=ON)	8m 13s
	1h 37m 34s

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