add Script key for cache (#36627)

Script component manages the cache as src or id. But in this example, id is missed.

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`

examples/with-google-tag-manager/pages/_app.js

@@ -16,6 +16,7 @@ function MyApp({ Component, pageProps }) {
     <>
       {/* Google Tag Manager - Global base code */}
       <Script
+        id="gtag-base"
         strategy="afterInteractive"
         dangerouslySetInnerHTML={{
           __html: `