fix: Fix nullability of logical InSubquery expression

[AdamGS]

Which issue does this PR close?

• Closes Logical InSubquery only take the expression nullability into account #23428.

Rationale for this change

Report correct nullability for InSubquery logical exprs.

What changes are included in this PR?

OR the expression's and the subquery's nullability, more like ScalarSubquery.

Are these changes tested?

1. Targeted unit tests InSubquery nullability
2. Unit tests to verify the expression simplifier handles these queries correctly.

Are there any user-facing changes?

No

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.41270% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.88%. Comparing base (62650ef) to head (a1a4508).

Files with missing lines	Patch %	Lines
datafusion/expr/src/expr_schema.rs	97.72%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #23429   +/-   ##
=======================================
  Coverage   80.87%   80.88%           
=======================================
  Files        1101     1101           
  Lines      375765   375827   +62     
  Branches   375765   375827   +62     
=======================================
+ Hits       303915   303975   +60     
+ Misses      53747    53746    -1     
- Partials    18103    18106    +3     

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