Report a warning/error when multiple instance of `@angular/core` are bundled.

### Command

build

### Description

When the CLI bundles Angular apps it can happen that multiple instances of `@angular/core` are bundled.

This leads to a variety of errors at runtime that are difficult to diagnose for developers.

Currently on the FW repo we point users toward : angular/angular#35586

### Describe the solution you'd like

I'd be great if the CLI could throw a warning/error when it happens so users are aware even before runtime that there is an issue with their bundle and they should have a look at their dependency resolution !

Comienza con el comando de build de la CLI e investiga cómo se representan la resolución de dependencias y las aplicaciones Angular empaquetadas durante el build. Revisa angular/angular#35586 para conocer el modo de fallo reportado con múltiples instancias de @angular/core. Se considera terminado cuando el build informa de una advertencia o un error al empaquetar varias instancias, antes del fallo en tiempo de ejecución.

Escrito por el modelo de indexación a partir del texto del issue.