Remove `FPEManager.*` and `SignalManager.*` from coverage file list

Actually, it is not easy to check these utilities and could be risky.
Checking these features could change the behavior of the other tests
unexpectedly.

CMakeLists.txt

@@ -447,7 +447,7 @@ if("${CMAKE_BUILD_TYPE}" STREQUAL "Coverage")
 
       COMMAND ${FASTCOV} -q --gcov "${GCOV_BIN}"
       --include "${PUGS_SOURCE_DIR}/src"
-      --exclude "${PUGS_SOURCE_DIR}/src/main.cpp" "${PUGS_SOURCE_DIR}/src/utils/BacktraceManager.*"
+      --exclude "${PUGS_SOURCE_DIR}/src/main.cpp" "${PUGS_SOURCE_DIR}/src/utils/BacktraceManager.*" "${PUGS_SOURCE_DIR}/src/utils/FPEManager.*"
       --lcov -o coverage.info -n
 
       COMMAND ${LCOV} --gcov "${GCOV_BIN}" --list coverage.info