chore: remove legacy arrow compute

[orlp]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 81.20%. Comparing base (2250055) to head (0451aaa).

Files	Patch %	Lines
crates/polars-arrow/src/compute/cast/decimal_to.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15164      +/-   ##
==========================================
+ Coverage   81.18%   81.20%   +0.02%     
==========================================
  Files        1347     1344       -3     
  Lines      175423   175360      -63     
  Branches     2506     2506              
==========================================
- Hits       142410   142403       -7     
+ Misses      32533    32478      -55     
+ Partials      480      479       -1     

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[ritchie46]

This is satisfying.