chore: Output BaseAggregateExec accurate unsupported names

[comphead]

Which issue does this PR close?

Part of #2382

Closes #.

Rationale for this change

Currently the code doesn't give a clue what group expression is not supported, adding clarity in this PR

What changes are included in this PR?

How are these changes tested?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.57%. Comparing base (f09f8af) to head (2731b49).
⚠️ Report is 496 commits behind head on main.

Files with missing lines	Patch %	Lines
.../scala/org/apache/comet/serde/QueryPlanSerde.scala	57.14%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #2383       +/-   ##
=============================================
- Coverage     56.12%   43.57%   -12.56%     
- Complexity      976     1083      +107     
=============================================
  Files           119      147       +28     
  Lines         11743    13418     +1675     
  Branches       2251     2349       +98     
=============================================
- Hits           6591     5847      -744     
- Misses         4012     6568     +2556     
+ Partials       1140     1003      -137     

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