canvas: Do not draw arc/ellipse with small sweep (#37630)

While raqote does already passes this test, but small line is still
visible and this PR will fix this. Vello will not work correctly without
this.


![slika](https://github.com/user-attachments/assets/195cd2c8-bea4-46d8-bf34-9c2d0b2e996e)


Testing: `/html/canvas/element/path-objects/2d.path.arc.twopie.1.html`

---------

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

components/canvas/backend.rs

@@ -200,6 +200,10 @@ pub(crate) trait GenericPathBuilder<B: Backend> {
 
         self.line_to(arc.from());
 
+        if sweep.radians.abs() < 1e-3 {
+            return;
+        }
+
         arc.for_each_quadratic_bezier(&mut |q| {
             self.quadratic_curve_to(&q.ctrl, &q.to);
         });