Write promoted_to_epic to transition table

Nicolas Dularrequested to merge
nd/write-promoted-to-epic-to-transitions into master

What does this MR do and why?

Write promoted_to_epic to transition table

This switches the write operation for promoted_to_epic to the work_item_transitions table. It also changes more read operations to the transitions table, so we can remove the promoted_to_epic field from the issues table after ignoring it.

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