Users should be able to provide multiple entity roles to an action

[Chris-Turner-NIST]

Entity Role was created to support the concept of "Scope" within CVSS. CVSS has evolved a few times since this was originally added making multiple nuanced concepts that may or may not apply. We should allow a user to apply any of those possible values, but maintain that each group of types should remain mutually exclusive from their pairs.

Example:
User should be able to associate "Component:Vulnerable" and "Security Authority:Primary" to the same Action.
User should not be able to associate "Security Authority:Primary" and "Security Authority:Secondary" to the same Action.