Include child projects a user can manage in namespace dropdowns
What does this MR do?
It makes sure the subgroups that a user can manage are included in dropdowns for creating and transferring projects.
Why was this MR needed?
Otherwise the user could not create projects in subgroups they have access to because they're a member of the parent group.## Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Review
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Has been reviewed by Backend
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What are the relevant issue numbers?
Edited by Sean McGivern