feat(docx): differentiate no-file from not-ZIP

[scanny]

Summary The python-docx error docx.opc.exceptions.PackageNotFoundError arises both when no file exists at the given path and when the file exists but is not a ZIP archive (and so is not a DOCX file).

This ambiguity is unwelcome when diagnosing the error as the two possible conditions generally indicate a different course of action to resolve the error.

Add detailed validation to DocxPartitionerOptions to distinguish these two and provide more precise exception messages.

Additional Context

• python-pptx shares the same OPC-Package (file) loading code used by python-docx, so the same ambiguity will be present in python-pptx.
• It would be preferable for this distinguished exception behavior to be upstream in python-docx and python-pptx. If we're willing to take the version bump it might be worth considering doing that instead.

[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ PackageNotFoundError: Package not found at '/tmp/tmp8ksp0slp/document.docx' /general/v0/general View Issue

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