Update cmake files and wamr-test-suites to support collect code coverage (#1992)

Support collecting code coverage with wamr-test-suites script by using
lcov and genhtml tools, eg.:
  cd tests/wamr-test-suites
  ./test_wamr.sh -s spec -b -P -C

The default code coverage and html files are generated at:
  tests/wamr-test-suites/workspace/wamr.lcov
  tests/wamr-test-suites/workspace/wamr-lcov.zip

And update wamr-test-suites scripts to support testing GC spec cases to
avoid frequent synchronization conflicts between branch main and dev/gc.

samples/sgx-ra/CMakeLists.txt

@@ -39,10 +39,6 @@ set (WAMR_BUILD_FAST_INTERP 1)
 set (WAMR_BUILD_LIB_RATS 1)
 
 # compiling and linking flags
-if (COLLECT_CODE_COVERAGE EQUAL 1)
-  set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fprofile-arcs -ftest-coverage")
-endif ()
-
 set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gc-sections")
 set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11 -ffunction-sections -fdata-sections \
                                      -Wall -Wno-unused-parameter -Wno-pedantic \

samples/wasi-threads/wasm-apps/CMakeLists.txt

@@ -16,6 +16,11 @@ set (CMAKE_C_COMPILER               "${WASI_SDK_DIR}/bin/clang")
 set (CMAKE_ASM_COMPILER               "${WASI_SDK_DIR}/bin/clang")
 set (CMAKE_EXE_LINKER_FLAGS         "-target wasm32-wasi-threads")
 
+if ("$ENV{COLLECT_CODE_COVERAGE}" STREQUAL "1" OR COLLECT_CODE_COVERAGE EQUAL 1)
+  set (CMAKE_C_FLAGS "")
+  set (CMAKE_CXX_FLAGS "")
+endif ()
+
 function (compile_sample SOURCE_FILE)
   get_filename_component (FILE_NAME ${SOURCE_FILE} NAME_WLE)
   set (WASM_MODULE ${FILE_NAME}.wasm)