Add ConnectionString parameter to backup cleanup function

Add optional ConnectionString parameter to Start-BackupRetentionCleanup function.

Signed-off-by: Zacgoose <107489668+Zacgoose@users.noreply.github.com>

Author: Zacgoose

Modules/CIPPCore/Public/Entrypoints/Timer Functions/Start-BackupRetentionCleanup.ps1

@@ -6,7 +6,10 @@ function Start-BackupRetentionCleanup {
     This function cleans up old CIPP and Tenant backups based on the retention policy
     #>
     [CmdletBinding(SupportsShouldProcess = $true)]
-    param()
+    param(
+        [Parameter(Mandatory = $false)]
+        [string]$ConnectionString = $env:AzureWebJobsStorage
+    )
 
     try {
         # Get retention settings