examples: replaced GTM component with GA in Google Analytics example (#73597)
### What?
Replaced the `GoogleTagManager` component with `GoogleAnalytics` in the
`with-google-analytics` example.
### Why?
The current implementation does not align with the
[docs](https://nextjs.org/docs/app/building-your-application/optimizing/third-party-libraries#google-analytics),
and a separate GTM example already exists.
### How?
Replaced the `GoogleTagManager` component with `GoogleAnalytics`.
Co-authored-by: Sam Ko <sam@vercel.com>