HTML reporter

[flunderpero]

Clear and concise description of the problem

@vitest/ui already creates a beautiful and very useful HTML report. We would like to have something similar created in our CI.

Suggested solution

Make @vitest/ui also a regular reporter.

Alternative

We can always convert the Junit output to HTML, but the UI of @vitest/ui is so much better.

Additional context

No response

Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guidelines.
• [X] Read the docs.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[antfu]

Sounds like a good idea. To make it possible, it might require some bug refactoring to UI to allow reading from static data instead of the WebSocket RPC. PR welcome if anyone wants to work on that.