This commit fixes memory leaks in unity tests when the debug option
CONFIG_FREERTOS_USE_LIST_DATA_INTEGRITY_CHECK_BYTES is enabled. The
commit increases the threshold to 1200 bytes from 1024 bytes.
Memory check (leaks and heap tracing) functions for unit tests
now have a separate file now and are renamed for more consistency.
BREAKING CHANGE: renamed memory check function names which may be used
in unit tests outside IDF.