Remove AlertAggregation

Remove AlertAggregation, Will add aggregation into Alert down the road.

ZertoApiWrapper/Public/Get-ZAAlertAggregation.ps1

@@ -1,20 +0,0 @@
-<# .ExternalHelp ./en-us/ZertoApiWrapper-help.xml #>
-function Get-ZAAlertAggeration {
-    [cmdletbinding()]
-    param(
-        [Parameter(
-            HelpMessage = "The ZORG identifier by which to filter the alert count. If the ZORG identifier is omitted, retrieves all alerts sorted by entity and by type."
-        )]
-        [ValidateNotNullOrEmpty()]
-        [string]$zOrgIdentifier
-    )
-    $uri = "monitoring/alerts"
-    if ( -not [String]::IsNullorEmpty($zOrgIdentifier) ) {
-        $filterTable = @{"zOrgIdentifier" = $zOrgIdentifier }
-        $filterString = Get-ZertoApiFilter -filterTable $filterTable
-        $uri = "{0}{1}&format=aggregations" -f $uri, $filterString
-    } else {
-        $uri = "{0}?format=aggregations" -f $uri
-    }
-    Invoke-ZARestRequest -uri $uri
-}