Filters BacktraceManager from coverage analysis

- Depends too much of the architecture and the execution context
- Seems to produce garbage in the Catch2 context

CMakeLists.txt

@@ -160,7 +160,7 @@ if("${CMAKE_BUILD_TYPE}" STREQUAL "Coverage")
     set(GCOVR_EXTRA "--gcov-executable=${LLVM_COV} gcov")
   endif()
 
-  set(GCOVR_OPTIONS --object-directory="${PASTIS_BINARY_DIR}" -r "${PASTIS_SOURCE_DIR}/src"  -e "${PASTIS_SOURCE_DIR}/src/experimental" -e "${PASTIS_SOURCE_DIR}/src/main.cpp" ${GCOVR_EXTRA})
+  set(GCOVR_OPTIONS --object-directory="${PASTIS_BINARY_DIR}" -r "${PASTIS_SOURCE_DIR}/src"  -e "${PASTIS_SOURCE_DIR}/src/experimental" -e "${PASTIS_SOURCE_DIR}/src/main.cpp" -e "${PASTIS_SOURCE_DIR}/src/utils/BacktraceManager.cpp" -e "${PASTIS_SOURCE_DIR}/src/utils/BacktraceManager.hpp" ${GCOVR_EXTRA})
 
   add_custom_target(run_unit_tests
     ALL