test(expression): add InExpr edge case tests

[poyrazK]

Summary

• Add 5 new tests for InExpr edge cases:
  • InExprWithDuplicates: verify duplicates in IN list work correctly
  • InExprWithManyValues: verify IN with 10 values works
  • InExprNotWithManyValues: verify NOT IN with many values
  • InExprWithNullInList: verify NULL in IN list follows SQL semantics
  • InExprEmptyList: verify IN with empty list returns false

Test plan

• Build and run expression_tests (67 tests pass)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 832f217e-3796-4d52-b94d-ad43ccd100d9

📥 Commits

Reviewing files that changed from the base of the PR and between fef0c80 and a6b3dd4.

📒 Files selected for processing (2)

• tests/expression_tests.cpp
• tests/operator_tests.cpp

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/expression-tests

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[poyrazK]

It's okay to merge