Zabbix

.......PS. [ZBX-24089] optimized configuration re-sync after empty initial syncs

Merge in ZBX/zabbix from feature/ZBX-24089-6.4 to release/6.4

* commit '228ddcaa13d9d39c9a5f9e03ec1cf49da4b48848':
  .......PS. [ZBX-24089] fixed changelog not to be used until configuration sync has synced some changelog related data
  .......PS. [ZBX-24089] added changelog support initialization logging, fixed empty database detection
  .......PS. [ZBX-24089] fixed hosts sync and added comments
  .D........ [ZBX-24089] added changelog entry
  .......PS. [ZBX-24089] leave changelog state uninitialized until configuration sync has synced some changelog related data