Clip Path Inset Large Radii

Issue 449638 - [CSS Masking][CSS Shapes] Large corner radii use with inset() clip-path are not properly constrained

The radii for this inset should be constrained in the same way that border-radii are constrained. If this happens correctly, you should see a blue ellipse.

NOTE: we should have a reftest but currently comparing this clip-path with a border-radius expectation will show small pixel differences around the curve.