refactor(rust): Remove has_validity, use has_nulls

[orlp]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 70.40816% with 29 lines in your changes missing coverage. Please review.

Project coverage is 80.50%. Comparing base (a5724d6) to head (d502bda).
Report is 4 commits behind head on main.

Files	Patch %	Lines
py-polars/src/map/series.rs	45.71%	19 Missing ⚠️
...es/polars-core/src/series/implementations/array.rs	0.00%	2 Missing ⚠️
...s-core/src/series/implementations/binary_offset.rs	0.00%	2 Missing ⚠️
...tes/polars-core/src/series/implementations/list.rs	0.00%	2 Missing ⚠️
crates/polars-core/src/chunked_array/ops/apply.rs	0.00%	1 Missing ⚠️
...ates/polars-core/src/chunked_array/ops/chunkops.rs	0.00%	1 Missing ⚠️
crates/polars-core/src/frame/mod.rs	0.00%	1 Missing ⚠️
py-polars/polars/series/series.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17519      +/-   ##
==========================================
+ Coverage   80.47%   80.50%   +0.03%     
==========================================
  Files        1482     1483       +1     
  Lines      195119   195156      +37     
  Branches     2778     2778              
==========================================
+ Hits       157026   157118      +92     
+ Misses      37582    37527      -55     
  Partials      511      511              

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[ritchie46]

Can you rebase?

[orlp]

@ritchie46 Done, sorry didn't see notification earlier.