Added employee number to user merge screen

[snipe]

Just adding this extra field to make it easier to see similarities between user accounts.

[what-the-diff]

PR Summary

• Introduction of Employee Number attribute in table
  A new section has been incorporated into the table to display the 'Employee Number'. This enhancement facilitates easier tracking and identification of each individual employee.

• Insertion of Employee Number in User Object
  Each user in the system will now possess an 'Employee Number' property. This modification serves to streamline the user identification process and allows for more efficient operations within the loop function applied on users.