Adopt integration tests for fresh zabbix installation

[danubie]

This PR covers the following changes

• add Zabbix v3.4 devcontainer config
• prepare 4.4 & 5-lastet devcontainer configs for next iteration
• fix serveral issues with param array and type conversion
• fix error creating user with no email address
• fix parameter name §Host
• fix test results "-Throw" where just returns $null
• add cleanup testdata after tests in integration tests

As a result

• Now integration tests run on a clean zabbix configuration
• Tested using
  • PS 5.1 & Windows 10
  • PS 7.1 & Windows 10 & ubuntu