[Fixes #14366] Upload error message

[mattiagiupponi]

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[gemini-code-assist]

Code Review

This pull request improves the error message raised when shapefile validation fails due to missing files, dynamically listing the required extensions, and adds a corresponding unit test. The review feedback identifies a grammatical error ('needs to have' instead of 'need to have') and a duplicate word typo ('with with') in the new error message, along with the need to update the corresponding test assertion.

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