CRUD Patron Groups add column for Number of Users

Purpose: To add column for Number of Users to Settings > Users > Patron Groups

Scenarios:

1. Scenario
   • Given the Patron Groups page under Settings > Users > Patron groups
   • When displayed
   • Then a column containing Number of users (the count of users assigned to this patron group) should display, as shown in patron-list-1_preview.png
2. Scenario
   • Given Patron group A displaying in the Patron groups table on Settings > Users > Patron groups
   • When a User X is assigned to Patron group A on User details
   • Then the count of users displaying for Patron A in the Patron groups table should increase by 1
3. Scenario
   • Given Patron group A displaying in the Patron groups table on Settings > Users > Patron groups
   • When a User X is removed from Patron group A on User details
   • Then the count of users displaying for Patron A in the Patron groups table should decrease by 1
   • This worked, except - when we moved someone from Visitor (the last patron group) to another patron group, and then back again, we ended up with 0, when there should have been 1. See additional comment below, and 3 attached videos demonstrating the problem.
4. Scenario
   • Given the Number of users displaying for Patron group A in the Patron groups table on Settings > Users > Patron groups
   • When > 0
   • Then:
     • The count should be a link to the search results page in the Users app
     • The search results should be pre-filtered to only display those in Patron group A
     • Patron group A should be selected in the patron group filter