Zabbix

..F....... [ZBX-21264] fixed empty service suggestions in SLA reports

Merge in ZBX/zabbix from feature/ZBX-21264-6.0 to release/6.0

* commit '4c43d6c2e4c9ae59cc373478052dca21c8b97c0f':
  A......... [ZBX-21264] fixed incorrect period uniqueness check
  A......... [ZBX-21264] fixed bounds of possible reporting periods in SLA
  ..F....... [ZBX-21264] fixed error message related to incorrect date instead of time on SLA reports
  A......... [ZBX-21264] relaxed period validation in selectStatusTimeline of the Service API
  ..F....... [ZBX-21264] fixed date range validation in SLA report and SLA report widget
  ..F....... [ZBX-21264] fixed wrong permission error message in SLA report widget
  ..F....... [ZBX-21264] fixed date validation in SLA reports and SLA report widget
  ..F....... [ZBX-21264] fixed empty service suggestions in SLA reports

(cherry picked from commit 73f1c745dc96825b2682bb97014d851878d365ea)