Entity label EntityBrowserFieldWidgetDisplay plugin should return a render array

The attached patch wraps the return value in a markup render array element.

silvi.addweb → made their first commit to this issue’s fork.

I have tested and it's working as accepted. I also raised MR for the same.

Both calls for this method seem to have check that converts strings, but makes sense to unify this.

Automatically closed - issue fixed for 2 weeks with no activity.