Stub ChorusConfig#workflow_enabled so unit test pass regardless of setting in chorus.properties.
[Fixes #59390246] Encoding::UndefinedConversionError from ASCII-8BIT to UTF-8

 - Workfile content saved by chorus is assumed utf-8 when reading from disk. This should be
fine for any ASCII characters (http://yehudakatz.com/2010/05/17/encodings-unabridged/)
 - Differences could occur with iso-8859-1, but chorus should be saving everything with utf-8.