Throw an error if client builds retain references to `*.server.ts` files

### Command

build

### Description

When SSR is enabled in an Angular project, there are a few `.server.ts` files produced (e.g. `app.config.server.ts`). The `.server.ts` suffix is also used by different applications as a way to structure and separate client and server code.

The proposal is to update the build pipeline to throw an error in case files with `.server.ts` suffix are present in the final client build output.

// cc @alan-agius4

从 Angular CLI build 命令开始，追踪启用 SSR 时最终客户端 build 输出的生成过程。验证 `.server.ts` 文件如何保留在该输出中；当存在此类文件时，build 都报告错误即表示完成。

由索引模型根据 Issue 内容生成。