Reduce resize poll rate

[tznind]

Fixes #2730 - Reduce screen buffer polling to 500ms from 10ms in net driver and 100ms in WindowsDriver

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[BDisp]

That a good idea using Task.Delay instead of Thread.Sleep because the last block the execution of any thread and the first continue the execution of others threads while is awaiting.

[tig]

This is in #2612 so I'm closing.