[angular] Promote vitest to default and drop jest support. #31472
Description
Overview of the feature request
Vitest support was promoted to stable in Angular v21.
Jest will probably not be promoted to stable now that vitest is supported.
To reduce maintenance burden and provide better out of the box experience, I propose to drop jest support.
Vitest is a bit slower in main, we should investigate some alternatives to increase speed. But provides a better experience.
Tasks:
- investigate alternatives to improve speed. Fixed in v21, no-default is taking less than half.
- add migration from jest
- check coverage
- add sonar integration
Motivation for or Use Case
Related issues or PR
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