test(query_executor): add GROUP BY tests

[poyrazK]

Summary

Add GROUP BY tests to query_executor_tests.cpp:

• Enhanced SelectWithGroupBy to verify actual aggregated values (A=30, B=5)
• Added SelectWithGroupByCount test (COUNT with column)
• Added SelectWithGroupByMinMax test (MIN/MAX aggregates)
• Added SelectWithGroupByMultipleColumns test (multi-column GROUP BY with 4 groups)

Test plan

• All 44 query_executor_tests pass

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2586175d-388d-46a2-8837-c23610180214

📥 Commits

Reviewing files that changed from the base of the PR and between d0140ec and 5fbc580.

📒 Files selected for processing (1)

• tests/query_executor_tests.cpp

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/vectorized-groupby

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[poyrazK]

It's okay to merge