[BE] Support for autocomplete in `work_items` scope

Siddharth Dungarwalrequested to merge
588616-add-autocomplete-backend into master

What does this MR do and why?

This MR adds backend support for work items in autocomplete and recent work items search, while maintaining full backward compatibility with the existing issue/epic autocomplete through a feature flag.

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Related to #588616 (closed)

Edited by Siddharth Dungarwal

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