fix: Allow converting DatetimeOwned to ChunkedArray

[coastalwhite]

Fixes #19086.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 79.76%. Comparing base (f55658b) to head (9943db5).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-core/src/series/any_value.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19094      +/-   ##
==========================================
- Coverage   79.77%   79.76%   -0.02%     
==========================================
  Files        1531     1531              
  Lines      208529   208531       +2     
  Branches     2913     2913              
==========================================
- Hits       166347   166325      -22     
- Misses      41631    41655      +24     
  Partials      551      551              

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