Allow group owners to modify names and usernames of Enterprise Users

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Proposal

As Enterprise Users are user accounts that are administered by an organization, group owners should have the ability to manage their attributes, such as usernames. This should be possible using both the UI and API. The managed_by_user? check could be used.

UI related issues:

• Edit User for Enterprise Users (#300184)
• New SaaS group Enterprise settings screen MVC (#375991)

Created as a result of Zendesk ticket (internal)