fix: add test for Parquet column pruning in scans

[jkylling]

Description

Adds test coverage for the regression fixed in 2272ff7

[codecov]

Codecov Report

Attention: Patch coverage is 47.97297% with 77 lines in your changes missing coverage. Please review.

Project coverage is 72.28%. Comparing base (cdc6473) to head (56889c1).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/core/src/delta_datafusion/mod.rs	47.97%	69 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3079      +/-   ##
==========================================
- Coverage   72.41%   72.28%   -0.13%     
==========================================
  Files         128      128              
  Lines       41017    41165     +148     
  Branches    41017    41165     +148     
==========================================
+ Hits        29701    29755      +54     
- Misses       9423     9502      +79     
- Partials     1893     1908      +15     

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