[2.3.0] Checkmk Werk 16205 created: Introduce Last seen for the REST API usage

Title: Introduce Last seen for the REST API usage Class: feature Compatible: compat Component: wato Date: 1700822001 Edition: cre Level: 1 Version: 2.3.0b1 Prior to this Werk, the last time a REST API user was used was not displayed in WATO and "Never logged in" was displayed. This Werk changes the behavior and now displays the date and time of when it was last used. These are the changes introduced in this Werk: * Last seen column shows "Never" if the user was never authenticated. * REST API users show the date and time when they last logged in. * In the Act. column, the login icon includes the means by which the authentication information was last received (bearer, cookie, etc.).