Variable contents are formatted using markdown #80
Description
Summary
Currently output is interpreted as markdown and therefore e.g. underscores don't show in the output.
E.g. event_definition_type from the test notification is displayed as eventdefinitiontype.
Environment
Graylog Web Interface version: Graylog 3.3.8+e223f85
Graylog MS Teams Plugin version: 2.0.3
To Reproduce
Send a test notification.
Expected behavior
Field names and message contents should be displayed in their original form.
One possible fix could be to provide a way to markdown-escape all variable contents or provide a way to explicitly add escaping to certain variables.
Screenshots
