User Assignment Required Set By Default

[nharper285]

For service principals created by the OneFuzz platform during deployment, we default to setting "User Assignment Required" to false. In the deployment script, this is controlled by the parameter app_role_assignment_required.

Proposed change: set app_role_assignment_required to true by default, and add the user who deploys a given instance of OneFuzz as a pre-authorized user. The owner/deployer could then add additional users, as necessary. We could enable this functionality by including a deployment parameter that takes in an authenticated group, as chosen by the deploying user.

AB#39994145