Test import with dask-expr on CI

[hendrikmakait]

Addresses #1308.

This PR is a first step toward ensuring compatibility with dask-expr. After getting the import to work at all, I recommend running the entire test suite with dataframe.query-planning=True on CI.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.09%. Comparing base (93bb1e5) to head (082fd48).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1309      +/-   ##
==========================================
- Coverage   85.54%   85.09%   -0.46%     
==========================================
  Files          77       77              
  Lines        4261     4259       -2     
  Branches      795      753      -42     
==========================================
- Hits         3645     3624      -21     
- Misses        447      466      +19     
  Partials      169      169              

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[charlesbluca]

Superseded by #1319