Add parameter validation functions and enhance tests for configuration data

Private/Assert-ConfigurationDataParameterAllowedValue.ps1

@@ -21,6 +21,16 @@ function Assert-ConfigurationDataParameterAllowedValue {
         return
     }
 
+    if($Value -is [System.Array] -and $Value -isnot [string]){
+        foreach($Item in @($Value)){
+            if($AllowedValues -notcontains $Item){
+                throw "Parameter [$Name] value [$Item] is not allowed. Allowed values are: $($AllowedValues -join ', ')."
+            }
+        }
+
+        return
+    }
+
     if($AllowedValues -notcontains $Value){
         throw "Parameter [$Name] value [$Value] is not allowed. Allowed values are: $($AllowedValues -join ', ')."
     }