Find and remove remaining UA-related code

[angel-tnc]

Why

After decomissioning UA functionality, there was still code remaining in several places that was no longer used

What

Remove non-functional UA-related code

Addresses TNT-191

[swarmia[bot]]

✅  Linked to Task TNT-191 · Remove old Google Analytics code from TinyCMS
➡️  Part of Epic TNT-15 · Move to GA4

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
staging-tiny-news-sites	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 26, 2023 9:02pm

2 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **tiny-news-curriculum** | ⬜️ Ignored ([Inspect](https://vercel.com/news-catalyst/tiny-news-curriculum/9SJXRszAKou4RnXw9bDEbxuFR7kf)) | | | Jun 26, 2023 9:02pm | | **tiny-news-sites** | ⬜️ Ignored ([Inspect](https://vercel.com/news-catalyst/tiny-news-sites/EkvQYgf5pXkcAzUxF6QdZLmL92g7)) | | | Jun 26, 2023 9:02pm |