Use local overlay position mode and alignment

When we show the context menu, we don't specify an explicit position other than the default one which is equal to the origin in the context of a local overlay position mode. We then rely on `AnchorCorner` and aligning the context menu child view in the stack with `top().right()` for pop-ups that need to appear at the top of the icon/button.

Co-Authored-By: Antonio Scandurra <me@as-cii.com>
db73d831c7Petros Amoiridis committed on 3/13/2023, 10:50:12 AMparentd2411a6
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