Fix AuthenticationFlows in Conditional Access Policy

[FabienTschanz]

Pull Request (PR) description

This Pull Request addresses an issue where the AuthenticationFlows property of a conditional access policy changed in Graph, thus leading to an incorrect provisioning of TransferMethods in the AADConditionalAccessPolicy resource.

The new definition of AuthenticationFlows is the following:

• $null if no transfer method is specified
• @{ transferMethods = '<value>' } if a transfer method is specified

Since one or two values can be used, separated by a comma, an additional check in Test-TargetResource was introduced, which checkes that if two values are specified, they can be written in any order.

To preserve backwards compatibility since TransferMethods doesn't have to be specified (while in newer exports it is always done by default), the property is only checked in Test-TargetResource if it is contained in PSBoundParameters. Otherwise, it will be ignored.

This Pull Request (PR) fixes the following issues

• Fixes What are the permitted values of [AADConditionalAccessPolicy]: TransferMethods ? #4961
• Fixes All Conditional Access policies fail to be migrated with non-terminating errors during Start-DscConfiguration #4960
• Fixes Issue when sync conditional access policy #4734
• Fixes AADConditionalAccessPolicy: deployment bug since version 1.24.522.1. It's working with 1.24.515.2 #4725

[ykuijs]

LGTM