Very minor fixes for import code [FC-0036]

[bradenmacdonald]

• The import code that accepts a file object should have type BinaryIO (any file-like object that produces bytes), not BytesIO (specifically an in-memory bytes object and not a file handle)
• As I experienced, if a TypeError occurred during import (e.g. because you forgot to open the CSV file as binary instead of as a string...) then the import task would become permanently stuck because TypeError exceptions were not caught.

No need for a version bump with this fix.

Private ref: can be considered part of FAL-3531.

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[pomegranited]

👍

• I tested this by running this branch in my devstack and testing importing a taxonomy CSVs and JSONs
• I read through the code
• I checked for accessibility issues N/A
• Includes documentation N/A
• User-facing strings are extracted for translation N/A

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