Update E2E tests as needed in community-plugins repo

• Start the RHDH instance
• Navigate to Administration and click on RBAC
• While adding a new role verify that users/groups can be searched by typing in the search field.
• Verify the changed title for the table, showing the number of users and groups currently selected in the table
• Verify the No records text when no users/groups are selected  
• Verify that clicking the X icon clears the search field and shows all users/groups.
• Verify that multiple users/groups can be selected at once.
• Verify that users/groups can be deselected individually.
• Verify that previously selected users/groups appear in the table when editing a role.
• Verify that previously selected users/groups are pre-checked in the dropdown.