[wasm] increase test max memory from 2G to 4G (#18459)

### Description
increase max memory from 2G to 4G for onnxruntime_test_all in
WebAssembly build.

cmake/onnxruntime_unittests.cmake

@@ -906,7 +906,7 @@ if (onnxruntime_ENABLE_TRAINING_TORCH_INTEROP)
 endif()
 if (CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
   set_target_properties(onnxruntime_test_all PROPERTIES LINK_DEPENDS ${TEST_SRC_DIR}/wasm/onnxruntime_test_all_adapter.js)
-  set_target_properties(onnxruntime_test_all PROPERTIES LINK_FLAGS "-s STACK_SIZE=5242880 -s ALLOW_MEMORY_GROWTH=1 --pre-js \"${TEST_SRC_DIR}/wasm/onnxruntime_test_all_adapter.js\" -s \"EXPORTED_RUNTIME_METHODS=['FS']\" --preload-file ${CMAKE_CURRENT_BINARY_DIR}/testdata@/testdata -s EXIT_RUNTIME=1 -s DEMANGLE_SUPPORT=1")
+  set_target_properties(onnxruntime_test_all PROPERTIES LINK_FLAGS "-s STACK_SIZE=5242880 -s ALLOW_MEMORY_GROWTH=1 -s MAXIMUM_MEMORY=4294967296 --pre-js \"${TEST_SRC_DIR}/wasm/onnxruntime_test_all_adapter.js\" -s \"EXPORTED_RUNTIME_METHODS=['FS']\" --preload-file ${CMAKE_CURRENT_BINARY_DIR}/testdata@/testdata -s EXIT_RUNTIME=1 -s DEMANGLE_SUPPORT=1")
   if (onnxruntime_ENABLE_WEBASSEMBLY_THREADS)
     set_property(TARGET onnxruntime_test_all APPEND_STRING PROPERTY LINK_FLAGS " -s DEFAULT_PTHREAD_STACK_SIZE=131072 -s PROXY_TO_PTHREAD=1")
   endif()