Install duckdb the default backend for ibis in the cudf.pandas integration tests

[Matt711]

Follows up #17945

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• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

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##             branch-25.04   #17972   +/-   ##
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[Matt711]

I'm marking this as DO NOT MERGE for now until I fix the failing ibis integration tests.

[mroeschke]

I think in python/cudf/cudf_pandas_tests/third_party_integration_tests/tests/test_ibis.py, you'll need to change ibis.set_backend("pandas") to ibis.set_backend("duckdb") or maybe ibis.set_backend(ibis.duckdb.connect())

EDIT: Actually, just fold in your changes from #17945?

[Matt711]

I think in python/cudf/cudf_pandas_tests/third_party_integration_tests/tests/test_ibis.py, you'll need to change ibis.set_backend("pandas") to ibis.set_backend("duckdb") or maybe ibis.set_backend(ibis.duckdb.connect())

EDIT: Actually, just fold in your changes from #17945?

Thanks I just removed set_backend("pandas") so ibis should use duckdb. Now I'm checking to see which tests I need to fix.

[Matt711]

/merge