Zabbix

.........T [ZBXNEXT-6522] added Brevis.one media

Merge in ZBX/zabbix from feature/ZBXNEXT-6522-5.0 to release/5.0

* commit '8a753073d731b06c34576ad67f6f6b4b67eaebfb':
  .........T [ZBXNEXT-6522] updated readme
  .........T [ZBXNEXT-6522] fixed {ALERT.SENDTO} check
  .........T [ZBXNEXT-6522] removed global variable usage
  .........T [ZBXNEXT-6522] fixed after review
  .........T [ZBXNEXT-6522] fixed after review
  .........T [ZBXNEXT-6522] fixed typo
  .........T [ZBXNEXT-6522] fixed after review
  .........T [ZBXNEXT-6522] added Brevis.one media