Zabbix

.......PS. [DEV-3798] changed atob output to uint8 array to prevent from using atob() to access internal/hidden object properties

Merge in ZBX/zabbix from feature/DEV-3798-7.0 to release/7.0

* commit '48a0d6515150b0acccc5e03e9616e75978d9bd9c':
  .......... [DEV-3798] added mock test
  .......... [DEV-3798] fixed warning
  .......PS. [DEV-3798] reworked buffer conversion in js methods expecting binary data
  .......PS. [DEV-3798] changed output of atob() function to Uint8Array, fixed memory leaks with type coercion failures when obtaining string or buffer