[Baikal] Support fastcgi format too

[LaurenceJJones]

Currently it seem the Baikal parser only support apache httpd log format and does not cover fastcgi via Nginx:

Sample logs:

2024/09/23 07:13:04 [error] 53#53: *13 FastCGI sent in stderr: "PHP message: user admin authentication failure for Baikal" while reading response header from upstream, client: 192.168.90.254, server: _, request: "POST /admin/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm.sock:", host: "SUBDOMAIN", referrer: "https://subdomain/admin/"

We should update this to cover both as Baikal supports both options via their installation instructions