Add the ability to change Enterprise Group which provides membership to Portal and AGOL Group

[gmattis1991]

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Is your feature request related to a problem? Please describe. We needed to update our Enterprise Groups which powered the membership of our Portal and AGOL groups from ADFS to Microsoft Azure and had no way to automatically do it via the API.

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Describe the solution you'd like Just as you are able to access and update properties of an ArcGIS Enterprise (AGE) or AGOL Group, we should be able to access and update the name of the enterprise group which powers the membership to the AGE or AGOL Group. Because of the change from ADFS to Microsoft Azure AD, our group names changed from physical security group names to the Azure AD Group GUID. Being that we have all of our groups membership based on Enterprise Groups, it would have been very helpful to have this done programmatically rather than having to do it manually.

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