fix(node): Wait for checkpoint service to stop during reconfig

[jkrvivian]

Description of change

Merge the fix from upstream: MystenLabs/sui@8d2bb84

Currently during reconfig, CheckpointService tasks, including CheckpointBuilder and CheckpointAggregator, are notified to shut down. But reconfig does not wait for them to finish shutting down. There can be a race between the reconfig loop proceeding to drop the epoch db handle, while CheckpointBuilder tries to read from epoch db when creating a new checkpoint. The race can result in panics.

Links to any relevant issues

Close #4691

Type of change

• Bug fix

Change checklist

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have checked that new and existing unit tests pass locally with my changes

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4 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
apps-backend	⬜️ Ignored (Inspect)			Feb 14, 2025 7:06am
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rebased-explorer	⬜️ Ignored (Inspect)			Feb 14, 2025 7:06am
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