[BUG]: Consistent output suppression in AzurePowershellV5

[mortenlerudjordet]

New issue checklist

• I searched for existing GitHub issues
• I read pipeline troubleshooting guide
• I checked how to collect logs

Task name

AzurePowershellV5

Task version

v5

Issue Description

New code addition in V5 does not follow same supression pattern as older versions.

Example old pattern in InitializeAz.ps1:
$null = Connect-AzAccount
$null = Set-AzContext

New code that does not follow this pattern (no $null):

elseif ($endpointObject.scheme -eq 'WorkloadIdentityFederation') {
    Write-Verbose "Using WorkloadIdentityFederation authentication scheme"

    $logStr = "##[command] Connect-AzAccount -ServicePrincipal -Tenant $($endpointObject.tenantId) -ApplicationId $($endpointObject.servicePrincipalClientID)"
    $logStr += " -FederatedToken ***** -Environment $environmentName -Scope Process"
    Write-Host $logStr
    Connect-AzAccount -ServicePrincipal -Tenant $endpointObject.tenantId -ApplicationId $endpointObject.servicePrincipalClientID `
        -FederatedToken $clientAssertionJwt -Environment $environmentName -Scope 'Process'

    if ($scopeLevel -ne "ManagementGroup") {
        Write-Host "##[command] Set-AzContext -SubscriptionId $($endpointObject.subscriptionID) -TenantId $($endpointObject.tenantId)"
        Set-AzContext -SubscriptionId $endpointObject.subscriptionID -TenantId $endpointObject.tenantId
    }
}

Please add supression as output often leaks into output from user code in pipeline output.
Output to terminal from task is often delayed and will show up in the middle of executing user code, and pollute output pipeline logs.

Environment type (Please select at least one enviroment where you face this issue)

• Self-Hosted
• Microsoft Hosted
• VMSS Pool
• Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

No response

Operation system

Windows

Relevant log output

Also output logs does not log as expected from task:

Connect-AzAccount System.Collections.Hashtable
VERBOSE: Command [Connect-AzAccount] succeeded.

Example of output pollution:
        (\__/) ||                    |( 王ﾉ〈         
        (•ㅅ•) ||                    /ﾐー―彡\        
        /    づ                     / ╰   ╯  \       
Account                              SubscriptionName TenantId                             Environment
-------                              ---------------- --------                             -----------
*** Company-core-mgm XXXXXX-XXXX-XXXX-XXXX-XXXXXXX AzureCloud

Startup tasks
[+] finding & importing configuration files

Full task logs with system.debug enabled

 [REPLACE THIS WITH YOUR INFORMATION] 

Repro steps

No response

[mortenlerudjordet]

New PR: #19694 without changes to helper function so make approval easier.

[mortenlerudjordet]

PR merged and issue will be closed