Allow users to override the default options of `@testing-library/user-event` used under the hood by Locator in preview mode

Clear and concise description of the problem

When using preview mode — mostly in webcontainer environments such as Stackblitz — methods such as Locator#fill never resolve when fake timers are in manual mode.

It would be nice if users could override the advanceTime option of userEvent.setup() that is used under the hood to either use real timers or advance fake timer.

Suggested solution

Allow users to configure default user-event options with some API such as:

import { userEvent }  from 'vitest/browser';
userEvent.setDefaultOptions({ advanceTime });

Another approach — which is probably better — is to make the PreviewLocator use a userEvent instance where the time is advanced with real timers.
This would make it more symmetric to other providers.

Alternative

No response

Additional context

No response

Validations

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

Start with packages/browser-preview/src/locators.ts, especially PreviewLocator and the userEvent.setup() instance used by Locator methods. Reproduce the manual fake-timer case in preview mode, then determine whether configurable user-event defaults or real-timer advancement is the intended direction; done means Locator#fill and related methods resolve in that environment.