refactor: Keep scalar in more places

[coastalwhite]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 33.22148% with 199 lines in your changes missing coverage. Please review.

Project coverage is 79.79%. Comparing base (a53bf03) to head (5be5abb).
Report is 105 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-core/src/datatypes/any_value.rs	29.62%	76 Missing ⚠️
crates/polars-core/src/frame/mod.rs	0.00%	61 Missing ⚠️
py-polars/polars/dataframe/frame.py	7.14%	13 Missing ⚠️
crates/polars-core/src/frame/column/mod.rs	86.04%	6 Missing ⚠️
...tes/polars-core/src/series/implementations/date.rs	25.00%	6 Missing ⚠️
py-polars/polars/lazyframe/frame.py	14.28%	6 Missing ⚠️
crates/polars-python/src/dataframe/general.rs	0.00%	5 Missing ⚠️
.../polars-core/src/series/implementations/boolean.rs	0.00%	4 Missing ⚠️
...s/polars-core/src/series/implementations/floats.rs	0.00%	4 Missing ⚠️
...ates/polars-core/src/series/implementations/mod.rs	0.00%	4 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18775      +/-   ##
==========================================
- Coverage   79.86%   79.79%   -0.07%     
==========================================
  Files        1517     1518       +1     
  Lines      205533   205758     +225     
  Branches     2892     2899       +7     
==========================================
+ Hits       164142   164186      +44     
- Misses      40843    41024     +181     
  Partials      548      548              

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