Zabbix

.......P.. [ZBX-19500] added avoiding of configuration cache update during transaction

Merge in ZBX/zabbix from feature/ZBX-19500-5.4 to release/5.4

* commit 'dfdbe1facb073685a23770018145db65ffe1aa48':
  .......... [ZBX-19500] updated ChangeLog entry
  .......P.. [ZBX-19500] coding style fixes
  .......P.. [ZBX-19500] fixed memory leak
  .......P.. [ZBX-19500] fixed remains of refactoring
  .......P.. [ZBX-19500] reworked diff vector preparation
  .......P.. [ZBX-19500] added handling of transaction error
  .......P.. [ZBX-19500] added avoiding of configuration cache update during transaction