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

[mergify]

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](https://mergify.com).

[coderabbitai]

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[yihuang]

we should tag 1.2.1 for this bug fix I think, and update it in cosmos-sdk 0.50.x branch. @cool-develope @tac0turtle

[tac0turtle]

on it,