Reset quantity in frontend when product changes (#1447)

* reset quantity when product ID changes

* update changelog

---------

Co-authored-by: Juliano Costa <julianocosta89@outlook.com>

Author: austinlparker

CHANGELOG.md

@@ -7,6 +7,8 @@ the release.
 
 ## Unreleased
 
+* [frontend] reset quantity when new product selected
+  ([#1447](https://github.com/open-telemetry/opentelemetry-demo/pull/1447))
 * [featureflag] deprecate in favor of flagd
   ([#1338](https://github.com/open-telemetry/opentelemetry-demo/pull/1388))
 * [checkoutservice] add producer interceptor for tracing

src/frontend/pages/product/[productId]/index.tsx

@@ -4,7 +4,7 @@
 import { NextPage } from 'next';
 import Image from 'next/image';
 import { useRouter } from 'next/router';
-import { useCallback, useState } from 'react';
+import { useCallback, useState, useEffect } from 'react';
 import { useQuery } from '@tanstack/react-query';
 import Ad from '../../../components/Ad';
 import Footer from '../../../components/Footer';
@@ -32,6 +32,10 @@ const ProductDetail: NextPage = () => {
   const { selectedCurrency } = useCurrency();
   const productId = query.productId as string;
 
+  useEffect(() => {
+    setQuantity(1);
+  }, [productId]);
+
   const {
     data: {
       name,