Bug 30418: Add ability for permitted staff to edit list contents

Bug 30418: Add ability for permitted staff to edit list contents

Public lists with 'Allow changes to contents from' = 'Permitted staff only'
can have their contents managed by Koha patrons with either of the
permissions below:

- superlibrarian permission
- catalogue permission + 'edit_public_list_contents' sub-permission

Test plan:
1. Apply patches, update database, restart services
2. In the staff client go to: Lists > New List
3. Create a list, choose 'Allow changes to contents from' => 'Permitted
staff only'

4. Log into the OPAC as a patron with no permissions.
5. Confirm you CANNOT add a biblio to the list from the OPAC search result page and
OPAC biblio detail pages

6. Log into the OPAC as a patron with only the 'catalogue' permissions
enabled
7. Confirm you CANNOT add a biblio to the list from OPAC search result
or biblio detail pages

8. Log into the OPAC as a patron with the 'catalogue' and
'edit_public_list_contents' permissions enabled
9. Confirm you CAN add/remove biblios from the OPAC search result and
biblio detail pages

10. Log into the OPAC as a patron with superlibrarian permissions
11. Confirm you CAN add a biblio to the list from the OPAC search result
page and OPAC biblio detail pages

12. Log into the staff client as a patron with only the
'catalogue' permission and confirm you CANNOT add/remove records from the
list

13. Log into the staff client as a patron with the 'catalogue' and
'edit_public_list_contents' sub-permission (found under 'Lists' parent
permission)
14. Confirm you CAN add/remove records from the list

15. Login into thestaff client as a patron with 'superlibrarian'
permissions and confirm you CAN add/remove records from the list

Sponsored-by: Catalyst IT, New Zealand
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>