[CoLab] re-publishing to Hypothes.is should modify existing annotations
Issue description; currently, additional (new) annotations are created when re-publishing from Hypothes.is - this is incorrect. uncompleted as part of #759 (closed) ;
Once published, the Editor will be able to edit report feedback text data and re-publish from the control panel. Re-publishing should update (override) existing data.
When publishing from Decision field to Hypothes.is; only a single annotation should be added in Hypothes.is and the same annotation should be overridden on a 're-publish' action.