feat: Add warning for outdated PowerShell version in Invoke-GetCippAlerts function

Author: JohnDuprey

Modules/CIPPCore/Public/Entrypoints/HTTP Functions/CIPP/Core/Invoke-GetCippAlerts.ps1

@@ -53,6 +53,16 @@ function Invoke-GetCippAlerts {
                 type  = 'error'
             })
     }
+    $PSMinVersion = [Version]'7.4.0'
+    if ($PSVersionTable.PSVersion -lt $PSMinVersion) {
+        $Alerts.Add(@{
+                title = 'PowerShell Version Out of Date'
+                Alert = ('Your CIPP API is running PowerShell {0}. PowerShell 7.4 or later is required for full compatibility. Please update your Function App to use PowerShell 7.4. For hosted customers, please contact the helpdesk.' -f $PSVersionTable.PSVersion)
+                link  = 'https://learn.microsoft.com/en-us/azure/azure-functions/functions-reference-powershell#powershell-versions'
+                type  = 'warning'
+            })
+        Write-LogMessage -message ('CIPP API is running PowerShell {0}. PowerShell 7.4 or later is required.' -f $PSVersionTable.PSVersion) -API 'Updates' -tenant 'All Tenants' -sev Alert
+    }
     if (!(![string]::IsNullOrEmpty($env:WEBSITE_RUN_FROM_PACKAGE) -or ![string]::IsNullOrEmpty($env:DEPLOYMENT_STORAGE_CONNECTION_STRING)) -and $env:AzureWebJobsStorage -ne 'UseDevelopmentStorage=true' -and $env:NonLocalHostAzurite -ne 'true') {
         $Alerts.Add(
             @{