Deprecate the "Read Files" Trigger

[jhorbulyk]

Other Feature Request

Description

The advantage of the Poll Files action is that:

• It explicitly lists the file URL in the message body. (With Read Files you need to retrieve the needed data from the message headers.)
• It doesn't manipulate the directory that you are reading from. (Read files moves files into a hidden directory.)

Based on this, most users actually don't want Read Files when Poll Files is much better.

Definition of Done

The "Read Files" Trigger is deprecated.