Fixed AzureRm and Az module warning

[v-snalawade]

Task name: AzurePowerShellV4,AzurePowerShellV5,AzureFileCopyV4,AzureFileCopyV5,AzureFileCopyV6

Description: Fixed warnings "Both Az and AzureRM modules were detected on this machine. Az and AzureRM modules cannot be imported in the same session or used in the same script or runbook. If you are running PowerShell in an environment you control you can use the 'Uninstall-AzureRm' cmdlet to remove all AzureRm modules from your machine. If you are running in Azure Automation, take care that none of your runbooks import both Az and AzureRM modules. More information can be found here: https://aka.ms/azps-migration-guide",
"You're using AzureRM which will be retired soon, please schedule an update."

Documentation changes required: (Y/N)N

Added unit tests: (Y/N) N

Attached related issue: (Y/N)

Checklist:

• Task version was bumped - please check instruction how to do it
• Checked that applied changes work as expected