Ensure trailing leave/out events are fired after a cancel event

Summary:
Changelog: [Internal] - Ensure trailing leave/out pointer events are fired after a cancel event

The pointercancel test checks that pointerleave/pointerout events are fired after a pointercancel which preivously wasn't occuring so this added call ensures so.

Reviewed By: NickGerleman

Differential Revision: D43886121

fbshipit-source-id: 9ea801e8f5fcd5855832cfac973bda6ba905998d

packages/react-native/React/Fabric/RCTSurfacePointerHandler.mm

@@ -640,6 +640,7 @@ RCT_NOT_IMPLEMENTED(-(instancetype)initWithTarget : (id)target action : (SEL)act
         }
         case RCTPointerEventTypeCancel: {
           eventEmitter->onPointerCancel(pointerEvent);
+          [self handleIncomingPointerEvent:pointerEvent onView:nil];
           break;
         }
       }