Update notes_controller_test to use note and note_comment factories

Update notes_controller_test to use note and note_comment factories

I've ported across the naming for each note from the old fixture names.
This helps in the mega-tests where multiple notes are tested at the
same time.

The number or results have changed in some tests, since there's little
point in creating e.g. 5 note comments when 2 is enough to test the
functionality.