Handle "Inventory: View instance records being suppressed for staff" permission on the back end.

Purpose: In the instance record, it's possible to mark the instance record, that it should not be displayed for staff - that means typical only viewable for catalogers, who are working on a draft record, etc. To support who can view these records, we need a permission that allows users (typical catalogers) to view instance records being check marked as 'Staff suppress'.

Usecase: Permission in Users to enable/disable the view of staff-suppressed instance records

Scenarios:

1. Scenario
   • Login to FOLIO Snapshot
   • Given the Inventory module
   • When enabled
   • Then a logical permission should be provided called "Inventory: View instance records being suppressed for staff"
2. Scenario
   • Given User A has been given the permission "Inventory: View instance records being suppressed for staff"
   • When User A accesses FOLIO
   • Then:
     • The Inventory app should be visible in the top navigation bar
     • The Inventory app should be fully accessible to User A, meaning User A can:
       • Search and filter instance, holdings and item records
       • View Instance records in detailed screen
       • View Instance records, which are being marked as suppressed for staff
       • View filter for Staff suppress in 1st pane - see UIIN-289
3. Scenario
   • Given User A has been given the permission "View instance records being suppressed for staff" as part of a custom permission set
   • When User A accesses FOLIO
   • Then User A should have all rights normally conferred by this permission (see scenario 2) plus whatever additional rights conferred by the users custom permission set.