[Breaking change] Migrate from AAD Graph to Microsoft Graph

[BethanyZhou]

Description

• Removed warning messages
• Removed duplicated cmdlets
• [Breaking change] Migrated from AAD Graph to Microsoft Graph
• [Breaking change] Changed the return id in PSDenyAssignment from Guid string to fully qualified id
• Allowed Id in Get-AzDenyAssignment to accept fully qualified id

Migration guide:
Id in Get-AzDenyAssignment still accept guid, no change for input.
The output of Get-AzDenyAssignment changes: Id changes from "22704996-fbd0-4ab1-8625-722d897825d2" -> "/subscriptions/4004a9fd-d58e-48dc-aeb2-4a4aec58606f/providers/Microsoft.Authorization/denyAssignments/22704996-fbd0-4ab1-8625-722d897825d2"

Get-AzDenyAssignment

Id                      : /subscriptions/4004a9fd-d58e-48dc-aeb2-4a4aec58606f/providers/Microsoft.Authorization/denyAssignments/22704996-fbd0-4ab1-8625-722d897825d2
DenyAssignmentName      : Test deny assignment 1
Description             : Test deny assignment for PS cmdlets
Actions                 : {foo/*}
NotActions              : {foo/*/read}
DataActions             : {foo/*}
NotDataActions          : {}
Scope                   : /subscriptions/4004a9fd-d58e-48dc-aeb2-4a4aec58606f
DoNotApplyToChildScopes : False
Principals              : {
                          DisplayName:  All Principals
                          ObjectType:   SystemDefined
                          ObjectId:     00000000-0000-0000-0000-000000000000
                          }
ExcludePrincipals       : {
                          DisplayName:  testuser
                          ObjectType:   User
                          ObjectId:     f8d526a0-54eb-4941-ae69-ebf4a334d0f0
                          }
IsSystemProtected       : True

Benefit for this change: scope can be included in Id

To get guid as before: Id.TrimEnd('/').Substring(Id.LastIndexOf('/') + 1)

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here