snyk - some variables should use the escape_string utility

[criamico]

When installing snyk in kibana, the variables don't allow having some special characters at the start (like * and &), but this could be easily solved by using the escape_string utility.

This would allow kibana to handle correctly string escaping and avoid cases like this one about the audit_id var.

[elasticmachine]

Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

[efd6]

I've looked into this in the past, before I filed elastic/kibana#184972. It did not work.