refactor(python): Minor non-breaking space ( ) tweak for HTML rendering

[alexander-beedie]

Closes #19859.

Note: the related Issue isn't a Polars bug, it's a configurable setting in JetBrains IDEs.

However, we don't need to substitute all spaces in the HTML output in order to preserve whitespace, just consecutive ones (eg: two or more adjacent spaces). This adjustment will tidy-up HTML table rendering in IDEs where showing special characters is the default.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.44%. Comparing base (282ed31) to head (e07418f).
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19864      +/-   ##
==========================================
+ Coverage   79.43%   79.44%   +0.01%     
==========================================
  Files        1550     1550              
  Lines      214976   215086     +110     
  Branches     2447     2447              
==========================================
+ Hits       170763   170877     +114     
+ Misses      43656    43652       -4     
  Partials      557      557              

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[stinodego]

Hey look, it's the regex master himself 😄