feat: streamline cancelRefetch

refetch never took a queryKey as param - it is always bound to the observer

src/core/tests/queryObserver.test.tsx

@@ -622,7 +622,7 @@ describe('queryObserver', () => {
       select: () => selectedData,
     })
 
-    await observer.refetch({ queryKey: key })
+    await observer.refetch()
     expect(observer.getCurrentResult().data).toBe(selectedData)
 
     unsubscribe()