Update "Portal" item in Catalog to display "ArcGIS Online" or "Portal" based on current active login

[LindsayRaabe_FPCWA]

When using ArcGIS Pro, we direct a lot of people to the "Portal" component of Catalog to find data, but this is an inaccurate label as we only have ArcGIS Online. In the past when I've referred to Portal, I've been corrected after clearing up confusion that Portal is only for Enterprise setups. 

IDEA: Change the Portal label to "ArcGIS Online" or "Portal" based on the current Active login.

This will help to clarify exactly which environment you are connected to and reflects the language we should be using when talking about the environment you are connected to.