chore: start tracking approvals in ReactGA (#2311)

* chore: start tracking approvals in ReactGA

* move reactga to swap-only code

src/pages/Swap/index.tsx

@@ -215,8 +215,14 @@ export default function Swap({ history }: RouteComponentProps) {
       }
     } else {
       await approveCallback()
+
+      ReactGA.event({
+        category: 'Swap',
+        action: 'Approve',
+        label: [trade?.inputAmount.currency.symbol, toggledVersion].join('/'),
+      })
     }
-  }, [approveCallback, gatherPermitSignature, signatureState])
+  }, [approveCallback, gatherPermitSignature, signatureState, toggledVersion, trade?.inputAmount.currency.symbol])
 
   // check if user has gone through approval process, used to show two step buttons, reset on token change
   const [approvalSubmitted, setApprovalSubmitted] = useState<boolean>(false)