Remove bulk_import_projects from frontend

What does this MR do and why?

In !113979 (merged) we removed the bulk_import_projecs feature flag from the backend codebase.

This MR removes the FF from the frontend codebase so we can properly render the project dropdowns.

Screenshots or screen recordings

N/A

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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Related to #339941 (closed)