chore(astro): move error-map

[florian-lefebvre]

Changes

• Moves the error map from content to core errors to prepare feat: add defineIntegration utility #10892

Testing

Tests should still pass

Docs

N/A, no changeset

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Latest commit: 223c853

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[Princesseuh]

Could we maybe rename it to zod-error-map? It's not immediately obvious from the name of the file what it does.