[New+, Enterprise]Policy for showing filename extension (#35000)

* add gpo: admx, gpo utils

* todo note

* BugReport tool

* implement policy in utility

* settings ui

* remove todo comment

* code fixes

* code fixes 2

* spell fix

src/common/GPOWrapper/GPOWrapper.idl

@@ -64,6 +64,7 @@ namespace PowerToys
             static GpoRuleConfigured GetConfiguredMwbValidateRemoteIpValue();
             static GpoRuleConfigured GetConfiguredMwbDisableUserDefinedIpMappingRulesValue();
             static String GetConfiguredMwbPolicyDefinedIpMappingRules();
+            static GpoRuleConfigured GetConfiguredNewPlusHideTemplateFilenameExtensionValue();
         }
     }
 }