make _lastKnownPosition trackable at dragging

[AnastassiaP]

What does the pull request do?

Makes pointer over to track last pointer position while dragging an item

What is the current behavior?

If you want to open flyout menu at the position where item was dropped after dragging using menuFlyout.Placement = PlacementMode.Pointer, currently, it opens it on a position where item was taken, not dropped, because last pointer position was not updated while dragging

What is the updated/expected behavior with this PR?

Now RawDragEvent is listened to update last pointer position too

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Fixed issues

Fixes #18104

[avaloniaui-bot]

You can test this PR using the following package version. 11.3.999-cibuild0054602-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[cla-avalonia]

@AnastassiaP,

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