fix(material/datepicker): page scrolling for fast keyboard repeat #24991
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In an earlier change we introduced a timeout between when the datepicker is opened and when focus is moved into the current view. This means that the browser has some time to fire another keyboard event before we start preventing their default actions from inside the calendar, potentially allowing the page to be scrolled.
These changes fix the issue by always preventing the default action of navigation keys at the overlay level.
Fixes #24969.