Create work_item_transitions table

Nicolas Dularrequested to merge
nd/create-work-item-transitions into master

What does this MR do and why?

Create work_item_transitions table

This table will serve to store the moved_to_id, promoted_to_epic, and duplicated_to_id.

It's part of the strategy to move this data out from the issues table to get rid of data and indexes on the issues table.

Changelog: added

Part of &18753

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How to set up and validate locally

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Edited by Nicolas Dular

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