Tabview: Fix issue with newly added items not behaving according to TabViews WidthMode #2752
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Description
Added code to ensure that the newly added TabView items know the parents TabView WidthMode and ensure that we update the TabViewItems update their compact sizing visual states on apply template.
Motivation and Context
Fixes #2711 Coincidentally, this also fixes #2724
How Has This Been Tested?
Fixed existing API test that already "tested" this.
Screenshots (if appropriate):