Zabbix

..F....... [ZBX-22332] fixed placeholder and default value for CSV to JSON preprocessing step parameters

Merge in ZBX/zabbix from feature/ZBX-22332-6.0 to release/6.0

* commit 'b2366e74f014144de8e8e8e6ee8ea8492a7319b4':
  .......... [ZBX-22332] fixed minor coding style issues in Selenium tests
  .......... [ZBX-22332] fixed some selectors in parameters
  .......... [ZBX-22332] added defaults and placeholders test scenario
  ..F....... [ZBX-22332] fixed placeholder and default value for CSV to JSON preprocessing step parameters

(cherry picked from commit 445e82495249a2ef51542e2d827ac086e056aea0)