chore: improve tests for array expressions

[andygrove]

Which issue does this PR close?

Part of #1345

Rationale for this change

Continuing to improve type checking and testing for array expressions.

What changes are included in this PR?

How are these changes tested?

[andygrove]

This turned out not to be very useful, since we don't support arrays when using COMET_CONVERT_FROM_PARQUET_ENABLED

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 23 lines in your changes missing coverage. Please review.

Project coverage is 39.09%. Comparing base (f09f8af) to head (e2dbe88).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...src/main/scala/org/apache/comet/serde/arrays.scala	26.92%	18 Missing and 1 partial ⚠️
.../scala/org/apache/comet/serde/QueryPlanSerde.scala	73.33%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #1339       +/-   ##
=============================================
- Coverage     56.12%   39.09%   -17.03%     
- Complexity      976     2065     +1089     
=============================================
  Files           119      260      +141     
  Lines         11743    60305    +48562     
  Branches       2251    12833    +10582     
=============================================
+ Hits           6591    23578    +16987     
- Misses         4012    32239    +28227     
- Partials       1140     4488     +3348     

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