Update Error Message for AD Deserialized Objects

Line 762 imports the Active Directory module. Later use of cmdlets require serialized AD objects which were not available on my Windows Server 2016, PowerShell 7.1.4, with ActiveDirectory module 1.0 machine.

Specifically, the "OverwriteExistingADObject" switch triggers the use of serialized AD objects on line 2555 and 2582. `Set-ADComputer **-Instance** $computerSpnMatch -ErrorAction Stop`

A more clear error message warning of this condition would be helpful. Our workaround was to just delete object manually and restart.

Edit: To clarify, this is for azure-files-samples/AzFilesHybrid/AzFilesHybrid.psm1