[Tagging] "Bare Bones" Update of Existing Taxonomy by Uploading

[bradenmacdonald]

"As an org-level admin, I can create a new taxonomy or update an existing taxonomy"

Acceptance Criteria

1. From the taxonomy list page, org-level admins will see a Re-import menu item for any taxonomy that they have permission to edit:
   
2. Clicking it will open a file dialog that the user can use to select any .json or .csv file (see [Tagging] Import a Taxonomy ("Bare Bones") #115 for note on how to do this)
3. The new data will then be imported and overwrite the previously available tags in the taxonomy.
4. If an error occurs, display an alert/toast and put the details in the browser console.
   

Developer Notes

• This UX is intentionally minimal - the workflow will be completely overhauled by [Tagging] Refined UX: Update a taxonomy by downloading and uploading #126 in the future.
• Screenshots above are for convenience - Figma is the most up-to-date source for mockups. The scale of UI elements seen in the screenshots above may be incorrect.