refactor(ivy): rename PipeDef.n to PipeDef.factory (#23883)

The original reason for this property to be short no longer holds true,
as pipes always need to be defined using `definePipe`.

PR Close #23883

packages/core/src/render3/pipe.ts

@@ -33,7 +33,7 @@ export function pipe(index: number, pipeName: string): any {
     pipeDef = tView.data[index] as PipeDef<any>;
   }
 
-  const pipeInstance = pipeDef.n();
+  const pipeInstance = pipeDef.factory();
   store(index, pipeInstance);
   return pipeInstance;
 }