LP1991103: Display a count of record notes in the staff catalog tab

LP1991103: Display a count of record notes in the staff catalog tab

To test:

1. Apply this patch.
2. Open a record in the staff catalog.
3. Add some record notes.  Note that the tab updates with the number of
   record notes on the record.
4. Delete some record notes. Note that the tab still updates
   accordingly.
5. Leave and come back to the record.  Note that the number still
   persists in that tab.

Release-Note: Show the total number of record notes in the Record Note tab in the staff catalog.

Sponsored-by: PaILS
Signed-off-by: Jane Sandberg <sandbergja@gmail.com>
Signed-off-by: Elizabeth Davis <elizabeth.davis@sparkpa.org>
Signed-off-by: Tiffany Little <tlittle@georgialibraries.org>
Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>