Don't run lcov on MacOS #427

Job	Run time
Linting checks with pre-commit	17s
Debug build on ubuntu-latest with build testing ON	11m 19s
Debug build on ubuntu-latest with build testing OFF	5m 39s
Release build on ubuntu-latest with build testing ON	11m 5s
Release build on ubuntu-latest with build testing OFF	5m 3s
Debug build on ubuntu-20.04 with build testing ON	12m 17s
Debug build on ubuntu-20.04 with build testing OFF	5m 54s
Release build on ubuntu-20.04 with build testing ON	11m 13s
Release build on ubuntu-20.04 with build testing OFF	5m 12s
Debug build on windows-latest with build testing OFF	9m 51s
Release build on windows-latest with build testing OFF	10m 23s
Debug build on macos-latest with build testing ON	20m 21s
Debug build on macos-latest with build testing OFF	10m 35s
Release build on macos-latest with build testing ON	17m 21s
Release build on macos-latest with build testing OFF	8m 28s
System tests ubuntu-latest	2h 1m 53s
	4h 26m 51s

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