Backport OPENIDM-13242: Updating relationship with the same object in a different relationship will not delete reverse references of the updated relationship.

Setup:

1. Add a property to the managed user schema called favoriteManager which has the same relationship setup as "manager".
2. Update manager and favoriteManager such that they return-by-default=true.
3. Create 3 users. empolyee1, employee2, boss1.
4. make the manager of employee1 and employee2 to be boss1.
5. make the favoriteManager of employee1 and employee2 to be boss1.

Request:

1. read the employee1 object with

   managed/user/employee1?_fields=*

   . Note that both the manager and favoriteManager should return in the results.

1. update the employee1's manager to be employee2:

   PUT openidm/managed/user/employee1 
   {
        [other user fields]...
        "manager": {"_ref","managed/user/employee2"} 
        "favoriteManager": {"_ref","managed/user/boss1"}
   }
   

Verify:

1. read the boss1 reports.

   managed/user/boss1?_fields=*,reports

1. It should be expected that boss1 no longer has employee1 as a report.