chore(core): use TS for next config

[deini]

What/Why?

Use typescript for next.config.ts, this is prep work for build-time locale.

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Name	Status	Preview	Comments	Updated (UTC)
catalyst-latest	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 12, 2024 2:39pm
catalyst-soul	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 12, 2024 2:39pm

4 Skipped Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **catalyst** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst/BcmzafJpGd5w5EkH4HDQRMLei1KJ)) | | | Nov 12, 2024 2:39pm | | **catalyst-au** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-au/5e65zS1JPNdVMrUKYo6zEAzmUnez)) | | | Nov 12, 2024 2:39pm | | **catalyst-uk** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-uk/2t52jDHvQ5GG4DqGDQ2uCzrSada9)) | | | Nov 12, 2024 2:39pm | | **catalyst-unstable** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-unstable/65TfRUmhFAeecTXnL6Z6xtfn3CQY)) | | | Nov 12, 2024 2:39pm |

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🦋 Changeset detected

Latest commit: 6e3651209adea70a0bccc445e667c8cbb0c169f5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | -------------------------- | ----- | | @bigcommerce/catalyst-core | Patch |

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⚡️🏠 Lighthouse report

Lighthouse ran against https://catalyst-latest-c4c245w5t-bigcommerce-platform.vercel.app

🖥️ Desktop

We ran Lighthouse against the changes on a desktop and produced this report. Here's the summary:

Category	Score
🟠 Performance	79
🟢 Accessibility	96
🟢 Best practices	100
🟠 SEO	82

📱 Mobile

We ran Lighthouse against the changes on a mobile and produced this report. Here's the summary:

Category	Score
🟢 Performance	90
🟢 Accessibility	96
🟢 Best practices	100
🟠 SEO	85