Remove unused coverage report script. #540

Job	Run time
B2 gcc-11	5m 7s
CMake msvc-14.2 Debug C++17	8m 58s
B2 clang-14	5m 18s
B2 msvc-14.2	8m 34s
CMake msvc-14.2 Release C++17	8m 43s
CMake gcc-11 17 Debug	8m 48s
B2 msvc-14.3	8m 27s
CMake msvc-14.3 Debug C++20	6m 33s
CMake gcc-11 20 Release	11m 23s
CMake msvc-14.3 Release C++20	8m 54s
CMake clang-11 17 Debug	5m 56s
CMake clang-11 20 Debug	6m 27s
CMake clang-13 17 Release	9m 47s
CMake clang-13 20 Release	9m 41s
CMake clang-14 17 Debug -stdlib=libc++	8m 6s
CMake clang-14 20 Release -stdlib=libc++	12m 19s
	2h 13m 1s

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