test(python): Add test for select(len())

[nameexhaustion]

Adds a test case from the repro at #20337

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.13%. Comparing base (00837b8) to head (10db36c).
Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20343      +/-   ##
==========================================
- Coverage   79.51%   79.13%   -0.39%     
==========================================
  Files        1569     1572       +3     
  Lines      218782   219839    +1057     
  Branches     2462     2462              
==========================================
+ Hits       173958   173961       +3     
- Misses      44256    45310    +1054     
  Partials      568      568              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.