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Optimize query for issue neighbors

What does this MR do and why?

This fixes slow queries when moving issues on an issue board.

This uses the technique / module described in https://docs.gitlab.com/ee/development/database/efficient_in_operator_queries.html

Related to #345921 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Heinrich Lee Yu

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