refactor: replaced heap mock with Linux-compatible heap component

Author: 0xjakob

host_test/CMakeLists.txt

@@ -3,7 +3,6 @@ cmake_minimum_required(VERSION 3.16)
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 set(COMPONENTS mqtt main)
 list(APPEND EXTRA_COMPONENT_DIRS
-                                 "mocks/heap/"
                                  "$ENV{IDF_PATH}/tools/mocks/esp_hw_support/"
                                  "$ENV{IDF_PATH}/tools/mocks/freertos/"
                                  "$ENV{IDF_PATH}/tools/mocks/esp_timer/"