Reorder the import columns in the table (fix #10872)

Reorder the columns in the import dialogue to reflect the changes in the [Import Redesign - Slide 2](https://docs.google.com/presentation/d/1px-ca8oWjMTsfiBKFZfUGys2eoooHpUAzcvjs11gjOw/edit#slide=id.p14)

Column ordering should be as follows
1. File
2. Group (optional - if user in multi groups)
3. User (optional - if user is admin and can import as another user)
4. Project/Dataset/Screen
5. Folder as Dataset indicator
6. Size