CDB3-4724 Додати можливість додавати документ типу digitalSignature у термінальному статусі

додати можливість завантажувати digitalSignature до об'єкту Cancellation в статусі Cancelled/Deleted:

• procedure
  • POST api/procedures/<proc_id>/cancellations/<cancellation_id>/documents
• announcement
  • POST api/jobber/announcements/jas/<anons_id>/cancellations/<cancellation_id>/documents
  • POST api/jobber/announcements/jal/<anons_id>/cancellations/<cancellation_id>/documents
• redemption
  • POST api/jobber/redemption/jrs/<redemption_id>/cancellations/<cancellation_id>/documents
  • POST api/jobber/redemption/jrl/<redemption_id>/cancellations/<cancellation_id>/documents
• execution
  • POST api/registry/executions/<execution_id>/cancellations/<cancellation_id>/documents
  • POST api/registry/large_executions/<execution_id>/cancellations/<cancellation_id>/documents
• asset
  • POST api/registry/assets/<asset_id>/cancellations/<cancellation_id>/documents
  • POST api/registry/large_assets/<asset_id>/cancellations/<cancellation_id>/documents