LP1839341 YAOUS editor batch operation improvements

LP1839341 YAOUS editor batch operation improvements

* Apply batch updates serially to avoid large parallel batches.
* Replace manual JSON string compilation with JSON.stringify()
* Show progress dialog during batch updates / hide toasts since they
  occur too fast to read.
* Batch update avoids applying the value "0" for numerics when the value
  is null or undefined.
* Minor linting

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Terran McCanna <tmccanna@georgialibraries.org>
Signed-off-by: Jane Sandberg <sandbergja@gmail.com>