Add support for Vitest VSCode Plugin and similar

### Command

test

### Description

As Angular does not provide a Vitest plugin, it can't expose a `vitest.config.ts` file to 3rd party tools such as IDEs.

This means that as of today, it is impossible to use Vitest VSCode Plugin, nor WallabyJS, nor WebStorm integration etc... unless users switch to Analog plugin https://analogjs.org/docs/features/testing/vitest

### Describe the solution you'd like

_No response_

### Describe alternatives you've considered

_No response_

从 `test` 命令开始，调查 Angular 目前如何向外部工具公开 Vitest 配置。使用 Vitest VSCode Plugin 重现这一限制，然后将其行为与 issue 中提到的 Analog plugin 进行比较。当该插件和类似的集成能够在不切换插件的情况下发现 Angular 项目的 Vitest 配置时，即视为完成。

由索引模型根据 Issue 内容生成。