fix(query): fix incorrect agg spill in new agg hashtable

[Freejww]

I hereby agree to the terms of the CLA available at: https://docs.databend.com/dev/policies/cla/

Summary

In PR #14905, we add spill for new agg hashtable ,but we found data loss caused by incorrect handling. this pr fix it by normalizing the data.

• Fixes #[Link the issue here]

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

[BohuTANG]

We need more agg spill tests to avoid this.