chore: Add checks to microbenchmarks for plan running natively in Comet

[andygrove]

Which issue does this PR close?

Closes #3019

Rationale for this change

If benchmark queries are not running fully natively then it could be due to a bug or incorrect config and we want to know this.

Example:

================================================================================
WARNING: Benchmark plan is NOT fully Comet native!
First non-Comet operator: Project
================================================================================
Query plan:
*(1) Project [cast(c1#11 as decimal(10,2)) AS c1#3226]
+- *(1) CometColumnarToRow
   +- CometScan [native_iceberg_compat] parquet [c1#11] Batched: true, DataFilters: [], Format: CometParquet, Location: InMemoryFileIndex(1 paths)[file:/tmp/spark-72dac88c-8ae1-4c75-8648-53306da6c526/parquetV1], PartitionFilters: [], PushedFilters: [], ReadSchema: struct<c1:string>

================================================================================

What changes are included in this PR?

Show a warning if a query does not run fully natively when running Comet (Scan + Exec).

How are these changes tested?

[andygrove]

This method is no longer used

[comphead]

should we keep one version for this methods to keep in sync the test behavior?

[andygrove]

I moved this to a new CometPlanChecker trait to avoid duplication.

We may want to rename this trait in the future if we move more code there.

[comphead]

lgtm thanks @andygrove

[mbutrovich]

Thanks for the quick fix, @andygrove!

[parthchandra]

lgtm

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.55%. Comparing base (f09f8af) to head (bc1dfa1).
⚠️ Report is 826 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3045      +/-   ##
============================================
+ Coverage     56.12%   59.55%   +3.43%     
- Complexity      976     1379     +403     
============================================
  Files           119      167      +48     
  Lines         11743    15496    +3753     
  Branches       2251     2569     +318     
============================================
+ Hits           6591     9229    +2638     
- Misses         4012     4970     +958     
- Partials       1140     1297     +157     

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