[PM-12684] Remove deprecated feature flag for Members TwoFA query optimization (#5076)

src/Core/Constants.cs

@@ -129,7 +129,6 @@ public static class FeatureFlagKeys
     public const string UnauthenticatedExtensionUIRefresh = "unauth-ui-refresh";
     public const string GenerateIdentityFillScriptRefactor = "generate-identity-fill-script-refactor";
     public const string DelayFido2PageScriptInitWithinMv2 = "delay-fido2-page-script-init-within-mv2";
-    public const string MembersTwoFAQueryOptimization = "ac-1698-members-two-fa-query-optimization";
     public const string NativeCarouselFlow = "native-carousel-flow";
     public const string NativeCreateAccountFlow = "native-create-account-flow";
     public const string AccountDeprovisioning = "pm-10308-account-deprovisioning";