evas: disable Eina Cow Garbage Collection on dynamic content.

evas: disable Eina Cow Garbage Collection on dynamic content.

Summary:
Dynamic content are likely to trigger an image state change at pretty
much every frame. This lead to unecessary attempt by Eina_Cow to
deduplicate/cleanup data that are changing all the time. This reduce
memory consumption in Expedite tests that in some small amount. The
gain get bigger the more animation you get on screen. There might be
other potential gain for heavy animated case.

Reviewers: zmike, Hermet, bu5hm4n, smohanty

Reviewed By: zmike

Subscribers: #reviewers, #committers

Tags: #efl

Maniphest Tasks: T8302

Differential Revision: https://phab.enlightenment.org/D10532