fix: Ensure list append uses correct dtype for scalar path

[mcrumiller]

Closes #21924.

Calling get_as_series downcasts the RHS scalar to the physical (i32 in the case of pl.Date) hence the error seen in the issue. This ensures it's properly recast to the logical.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.83%. Comparing base (0aa889b) to head (3b1a194).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #21926   +/-   ##
=======================================
  Coverage   80.83%   80.83%           
=======================================
  Files        1628     1628           
  Lines      235118   235119    +1     
  Branches     2693     2693           
=======================================
+ Hits       190059   190068    +9     
+ Misses      44425    44417    -8     
  Partials      634      634           

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[mcrumiller]

Failed test is a worker node crash, unrelated to PR.

[ritchie46]

I really think we should try to solve this in the type coercion. We made the mistake to do this in the kernels, but we should correct that.