The unit-test builder doesn't re-run test suites on changes to non-spec files

### Command

test

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

Storybook has support for running component tests using Vitest. When trying to build a POC with the `unit-test` builder, I ran into two issues.

- Storybook can't transform the stories because the compiled code leads to file with just an`import` as its contents.
- Making changes to files that aren't in the `include` array doesn't trigger tests to be re-run.

I was able to work around the code import issue with a plugin that re-exports the chunks from compiled files
https://github.com/brandonroberts/angular-storybook-vitest/blob/main/vitest-storybook-base.config.ts#L16

### Minimal Reproduction

https://github.com/brandonroberts/angular-storybook-vitest

1. Clone and install dependencies
2. Run `npm run test-storybook`
3. Note the tests pass
4. Make a change in one of the `src/stories/*.stories.ts` files
5. Note the build re-compiles but the tests aren't re-run.

The `test-storybook` target excludes the `stories` files because of the import issue so they are transpiled as-is.

https://github.com/brandonroberts/angular-storybook-vitest/blob/main/angular.json#L94

### Exception or Error

```text
No exception
```

### Your Environment

```text
Angular v21
```

### Anything else relevant?

_No response_

Commencez par la reproduction liée, sa angular.json test-storybook target et npm run test-storybook. Modifiez une story non incluse ou un autre fichier pertinent et observez si le build se recompile sans relancer les tests. C’est terminé lorsque les modifications apportées à des fichiers situés en dehors de l’include array déclenchent à nouveau la suite de tests ; une pull request ouverte est déjà liée à cette issue.

Rédigé par le modèle d'indexation à partir du texte de l'issue.