[Website]: Document Agentless integrations work across traffic filters in 9.1.x

[lucabelluccini]

Type of issue

None

What documentation page is affected

https://www.elastic.co/docs/solutions/security/get-started/agentless-integrations

What happened?

We should document that Agentless integrations can work with Traffic Filters now (elastic/kibana#230368).

Additional info

No response