[iOS] Fix Button image sizing and layout #22476
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Description of Change
This PR is a continuation of this previous PR: #21759.
The past PR was rolled-back because it contained an infinite loop in certain circumstances when the parent of the button was resized.
To combat this, the iOS button layout code was moved to the ArrangeOverride method with the size allotted from the parent. This also matches where Android and Windows calculates and arranges the layout.
UITest changing the parent size and rotation:
ButtonRotationResizing.mov
UITest testing the measuring code and changing the image position:
iOSButtonChangingLayoutPosition.mov
UITest testing the image resizing when BorderWidth changes
iOSButtonBorderWidth.mov
If you'd like to test some cases, here are some code samples:
Issues Fixed
Fixes #22306