feat: Improve hash aggregate fallback reporting

[andygrove]

Which issue does this PR close?

Closes #.

Rationale for this change

What changes are included in this PR?

How are these changes tested?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 14.28571% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.33%. Comparing base (f09f8af) to head (fdec9df).
⚠️ Report is 757 commits behind head on main.

Files with missing lines	Patch %	Lines
...n/scala/org/apache/spark/sql/comet/operators.scala	14.28%	23 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2884      +/-   ##
============================================
+ Coverage     56.12%   59.33%   +3.20%     
- Complexity      976     1374     +398     
============================================
  Files           119      167      +48     
  Lines         11743    15362    +3619     
  Branches       2251     2557     +306     
============================================
+ Hits           6591     9115    +2524     
- Misses         4012     4960     +948     
- Partials       1140     1287     +147     

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