Change the way we call powershell in AzurePSCmdlet

[isra-fel]

Fi xes Azure/azure-powershell#11492

[isra-fel]

Dingmeng, I've tested it in a local build and it works.

[isra-fel]

Tested. It works perfectly:

C:\Users\yeliu> $job = Start-Job -ScriptBlock {
>>     $DebugPreference = "Continue";
>>     Write-Debug "DEBUG - LOOK AT ME OVER HERE";
>>     $global:ErrorActionPreference = "Stop"
>>     Import-Module ~\isra-fel\azure-powershell\artifacts\Debug\Az.Accounts\
>>     Get-AzContext
>>
>>     $DebugPreference = "Continue";
>>     Write-Debug "DEBUG - LOOK AT ME DOWN HERE";
>> }

C:\Users\yeliu> $job | Wait-Job

Id     Name            PSJobTypeName   State         HasMoreData     Location             Command
--     ----            -------------   -----         -----------     --------             -------
1      Job1            BackgroundJob   Completed     True            localhost            …

C:\Users\yeliu> $DebugRecords = $job.ChildJobs[0].debug.readall()
C:\Users\yeliu> foreach ($r in $DebugRecords) {
>>     Write-Host $r
>> }
DEBUG - LOOK AT ME OVER HERE
Sought all Az modules and got latest version 3.8.0
4:21:24 PM - GetAzureRMContextCommand begin processing with ParameterSet 'GetSingleContext'.
4:21:24 PM - using account id 'yeliu@microsoft.com'...
AzureQoSEvent: CommandName - Get-AzContext; IsSuccess - True; Duration - 00:00:00.2392776;
Finish sending metric.
4:21:25 PM - GetAzureRMContextCommand end processing.
DEBUG - LOOK AT ME DOWN HERE