[MCC-1515548] Python Lib - Data type of fetch_data() does not match d…

[butsyk-mdsol]

…ata type as shown in PWB

feature/bug/enhance/refactor/tech_debt/hotfix

• Python Lib - Data type of fetch_data() does not match data type as shown in PWB
• MCC-1507281

Checklist

• Review the pull request to fix typos and ensure variable/function names are intuitive, etc.
• Make sure the pull request does not have excessive number of unnecessary commits. Utilize the git commit --amend --no-edit command to reduce commit messages when making small file changes (like changing linespacing).
• Make sure you have added unit tests for the code changes. Tests should be added in the tests/ folder.
• Modify docs, if required. Add any new documentation in the doc/ folder.
• Rebase on latest active development branch (develop/main).

Changes Summary

Clear schema metadata so types_mapper reliably maps Arrow types to ArrowDtype (embedded pandas metadata can override types_mapper, causing object dtypes).

Deployment Notes

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[Copilot]

Pull request overview

This PR adjusts the Arrow→Pandas conversion used by fetch_data() to ensure Arrow-backed dtypes are consistently produced, matching the expected dtype behavior shown in PWB (avoiding unexpected object dtypes caused by embedded pandas schema metadata).

Changes:

• Read the Arrow IPC stream into a pyarrow.Table before conversion.
• Strip schema-level metadata from the Arrow table to prevent pandas metadata from overriding types_mapper.
• Convert to pandas with types_mapper=pd.ArrowDtype after metadata removal.

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