fix: fix Invalid URL error when using uppercase i18n url

[sarahetter]

Summary

When adding a locale such as de-DE to next.config.ts, we were giving an Invalid URL error as it our cdn lowercases paths. By adding a rewrite when these locale redirects are happening, we are able to point at the correct site.

Test plan

1. Visit the middleware Deploy Preview /de-DE/static route
2. Observe that the page shows up without an Invalid URL error

Relevant links (GitHub issues, Notion docs, etc.) or a picture of cute animal

Fixes https://github.com/netlify/pod-ecosystem-frameworks/issues/300

Standard checks:

• Check the Deploy Preview's Demo site for your PR's functionality
• Add docs when necessary

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🧪 Once merged, make sure to update the version if needed and that it was published correctly.

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[nickytonline]

Looks good. Left a dusty comment.

[sarahetter]

@ascorbic / @nickytonline Just looked with Nick - PR looks fine, just a few of the deploy previews are failing because it's unable to find the new @netlify/edge-functions (and some are able to find it properly 😕 )

I'm away for December, can one of you take care of this while I'm gone?

[ascorbic]

I think I know what's up. I'll take a look