fix: make sure lock guard is dropped before next recluster

[zhyass]

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Summary

make sure lock guard is dropped before next recluster
https://github.com/datafuselabs/databend/actions/runs/9267284916/job/25494541991?pr=15644

• 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):

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This change is