[fabric] Add support for clipsToBounds to RCTViewComponentView

Summary: This diff conditionally sets the CALayer masksToBounds based on the clipsToBounds RN property so that the content of the view would be clipped by the view border.

Test Plan:
- Run Zeratul with Fabric enabled
- Check that the profile pictures with no status indicator are clipped by the half size border radius set on the parent view.

| Before | After |
|--|
|  {F1090251649}  |  {F1090249259}  |

Reviewers: shawndempsey, chpurrer, #rn-desktop

Reviewed By: chpurrer

Differential Revision: https://phabricator.intern.facebook.com/D49239973

packages/react-native/React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm

@@ -653,6 +653,11 @@ - (void)invalidateLayer
     return;
   }
 
+#if TARGET_OS_OSX // [macOS
+  // clipsToBounds is stubbed out on macOS because it's not part of NSView
+  layer.masksToBounds = self.clipsToBounds;
+#endif // macOS]
+
   const auto borderMetrics = _props->resolveBorderMetrics(_layoutMetrics);
 
   // Stage 1. Shadow Path