User Fixture: provide a means to step binding refresh

[jeffective]

There should be a way to step the refresh from the user fixture.

Currently you can accomplish this with nicegui.binding._refresh_step(), but the user fixture is extremely aggressive about logs, including binding refresh interval overruns. This causes flakes in CI on cpu constrained machines.

Provide a method which does not check the time required to perform the refresh.

[rodja]

Hello @jeffective. Do you have an short example where you need to step the binding refresh loop? Normally with user.should_see will allow the event loop (and thereby the binding refresh loop) to advance.
And secondly: why do you get binding refresh warnings in the first place?