fix: i18n middleware impossible config

[florian-lefebvre]

Changes

• Found in fix: incorrect configuration in tests  #14858

Testing

Type tests

Docs

withastro/docs#12797

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[ematipico]

Awesome! Thank you @florian-lefebvre

I believe we actually have a test that still uses the incorrect configuration (we fixed in feat/environment-api but not in next)

[florian-lefebvre]

Perfect, we'll see if it works then!

[florian-lefebvre]

Actually it doesn't catch the test failure because redirectToDefaultLocale wasn't provided at all altough it's required by the types

[sarah11918]

Reviewed as requested!