CEC-4498 update fleetsAPI.addFleetVehicle to send vehicle in an array (#351)

* CEC-4498 update fleet-vehicle-add api to take an array of vehicles

src/components/useStyles.jsx

@@ -295,6 +295,14 @@ const useStyles = makeStyles((theme) => ({
     whiteSpace: "normal",
     wordWrap: "break-word",
   },
+  fleetVehicleAddSubmit: {
+    position: "sticky",
+    bottom: 0,
+    right: 0,
+    width: "100%",
+    padding: "16px 0",
+    backgroundColor: "#fafafa",
+  }
 }));
 
 export default useStyles;