`unit-test` builder could align with Vitest's `headless` option

[yjaaidi]

Command

test

Description

It would be nice if unit-test builder could take a headless option.
Separating browsers list and the headless option should provide a better DX.
For instance, one could run ng test --headless instead of using the --browsers option and providing the list of browser with the Headless suffix.

Describe the solution you'd like

No response

Describe alternatives you've considered

The curent workaround is to use CI=1 ng test.

[angular-robot]

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