Fix parent dropdown being empty for issue creation in create modal view

What does this MR do and why?

Fix parent dropdown being empty in modal view

Changelog: fixed

Related issue : No available parents when creating Task from wo... (#550928 - closed)

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Go to any project
2. Try to create a new issue from super sidebar
3. Try to open the parent sidebar dropdown from the modal
4. See that there are valid epics(work items) being returned for the same

MR acceptance checklist

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