[GPO]Add policy to define the run at startup setting (#37385)

* [GPO]Add policy to define the run at startup setting

* Use message for single setting managed by policy instead

src/common/GPOWrapper/GPOWrapper.idl

@@ -67,6 +67,7 @@ namespace PowerToys
             static String GetConfiguredMwbPolicyDefinedIpMappingRules();
             static GpoRuleConfigured GetConfiguredNewPlusHideTemplateFilenameExtensionValue();
             static GpoRuleConfigured GetAllowDataDiagnosticsValue();
+            static GpoRuleConfigured GetConfiguredRunAtStartupValue();
         }
     }
 }