Currently a new temp directory is created for every process via
mkdtemp_clean() which cleans it on process exit.

However, this is not compatible with using --preload option of
gunicorn. With this option the tmp directory is created on gunicorn
start and is shared by all the workers. But when a worker exits it
deletes the directory. And so on the next requent the tmp directory
needs to be recreated and the templates need to be recompiled.

LMS-6507