create test folder with parent id of the default root folder id zero #5689
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I encountered a broken UI after running core tests that inserted folder with a null parent_id. I may still add some code to the UI to assume this state as the root (id=0) folder as parent.
But investigating which tests were inserting folders with a null parent_id (updated to zero in this PR) led me to this #4461.
So wondering why we didn't just do this update back then instead of all the special null handling we introduced.