Feature: #107953 - Add "Current logged-in users" filter to the "Backend Users" module 

See forge#107953

Description 

A new filter option Current logged-in users has been added to the Administration > Users module. This feature allows administrators to quickly list all backend accounts that are currently active.

The detection mechanism is based on the lastlogin timestamp in combination with the global configuration value $GLOBALS['TYPO3_CONF_VARS']['BE']['sessionTimeout'] , which defines the maximum lifetime of backend user sessions.

Impact 

Administrators can now filter backend users by those who are currently logged in, providing an immediate overview of active sessions directly within the Administration > Users module.