EVENTS: Role based permissions for admin/volunteer

[EmilyLuijbregts]

This is a breakout from Events Epic #2039

Requirement: As a system administrator I want to ensure that there are defined role breakdowns for both admins and volunteers.

Definition of Done:

• A volunteer should be upgraded to admin for the event that they are registered for. They should not be granted admin rights elsewhere in the application.

Additional Information:

• Comment from @stevejgordon : o QUESTION. We have roles for org and site admins in the system. We are adding campaign and event manager roles also. Volunteers have no special role. Do we need to review the permissions for each role in the system to validate that we have the required access and functionality?
• Comment from Jim: At this time I do not see a need for Vol roles
• Comment from Pascal: Need to make sure when a volunteer is upgraded to admin for an event is not granted admin to other events unless authorized.

[MisterJames]

We will have to discuss this one at our next standup...I think we need some additional details/direction here. I want to get at the reason this was brought up so that we can make sure we're lined up for future authorization requirements.