Zabbix

........S. [ZBX-25081] reduced alerts table polling in alert syncer

Merge in ZBX/zabbix from feature/ZBX-25081-7.0 to release/7.0

* commit '771950f9fc73dce0fc24a862b28a963489ed5417':
  ........S. [ZBX-25081] style fix
  ........S. [ZBX-25081] fixed initial alert load
  ........S. [ZBX-25081] removed redundant escalator->alerter notification
  ........S. [ZBX-25081] fixed alert creation for users without defined media
  .D........ [ZBX-25081] added changelog entry
  ........S. [ZBX-25081] removed regular alerts table polling for new alerts
  ........S. [ZBX-25081] reworked alerter notification sending from escalator on new alert creation
  ........S. [ZBX-25081] simplified new escalation notification handling in escalator, added notification message draining
  ........S. [ZBX-25081] simplified message alert creation depending on problem/recovery event