LPS-50185 Cron task for clean up temp files

From Iván: 
Please don't change the name of the TemporaryFilesMessageListener class to anything larger because it will prevent the portal from loading it. I've filed https://issues.liferay.com/browse/LPS-50217 to see if it can be fixed, but until then we must keep this class name < 80 chars wide.

Feel free to provide any solutions you may come up with.

Thanks.