For system, network and cloud administrators
In order to remove all Azure managed disks that start with the name disk, in your PowerShell session type:
Get-AzDisk -ResourceGroupName yourgroupresource -Name 'disk*' | Remove-AzDisk -Force -Verbose
The above command can also support the -AsJob parameter which will allow you to execute further PowerShell commands (in the same session) while the command is being executed in the background as in asynchronously.