ToolTip should use Popup internally + fix Popups not closing when placement target is closed #15358
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What does the pull request do?
Simplifies bunch of code and should have been done a while ago. All other popup-like controls are already based on Popup itself - Flyout, ContextMenu. The same is expected about third party controls, none should use IPopupHost directly.
How was the solution implemented (if it's not obvious)?
There should be zero behavioral changes.
cc @grokys @TomEdwardsEnscape