fix: close the pruning process properly (backport #970)

[mergify[bot]]

Context

close: #966

Summary by CodeRabbit

• New Features

  • Introduced a new API to close the pruning process when the node database is closed, enhancing resource management and system stability.

• Bug Fixes

  • Improved cancellation handling during the pruning process to prevent memory leaks and ensure graceful termination of operations.

• Tests

  • Added a test to verify the closure functionality of the NodeDB instance, ensuring it can close without errors.

---

This is an automatic backport of pull request #970 done by Mergify.

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