fix(rust): Ensure result name of pow matches schema in grouped context

[wence-]

We must transfer the name from the base column to the result so that the rule that the left operand produces the result name is obeyed.

• Closes Schema for groupby-agg of literal raised to some power does not match collect result. #18524

[ritchie46]

If CI is green. :)

[wence-]

If CI is green. :)

Ah oops, I had this based on py-polars 1.6.0 (before the smallstr changes) and then just ported it forward and didn't check if things still built.

[wence-]

But note that this does induce a behaviour change (and I had to update a test that was checking for the old naming behaviour), so it is "breaking".

[wence-]

Looks like the recent 0.4.3 uv release changed some dependency solve resolution and the 3.12 mypy failure is that it backtracks to try and install llvmlite 0.36, which is not supported on 3.12.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.83%. Comparing base (af8738c) to head (ce7a915).
Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18533   +/-   ##
=======================================
  Coverage   79.82%   79.83%           
=======================================
  Files        1502     1502           
  Lines      201933   201936    +3     
  Branches     2868     2868           
=======================================
+ Hits       161201   161211   +10     
+ Misses      40186    40179    -7     
  Partials      546      546           

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[ritchie46]

If we didn't respect LHS, the test was flawed.