Description

Fix #18616

az role assignment create: Support ForeignGroup for --assignee-principal-type

Azure CLI overrides PrincipalType in #16056 because of REST spec issue Azure/azure-rest-api-specs#11830.

The code is copied from Python SDK azure.mgmt.authorization.v2020_04_01_preview.models._authorization_management_client_enums.PrincipalType

foreign_group = "ForeignGroup"

This PR is still a workaround and the ultimate solution should be the fix for Azure/azure-rest-api-specs#11830.

Testing Guide

> az role assignment create -h

    --assignee-principal-type     : Use with --assignee-object-id to avoid errors caused by
                                    propagation latency in AAD Graph.  Allowed values: ForeignGroup,
                                    Group, ServicePrincipal, User.