FIX: Clean up old CAPA rules and remove FLOSS for Strelka backend

[weslambert]

CAPA has been deprecated and is no longer included in the Docker image. We need to remove the rules used for CAPA since they are no longer used. We also need to remove FLOSS since it is no longer used.

target/strelka#413

https://github.com/Security-Onion-Solutions/securityonion-image/blob/2.4/dev/so-strelka-backend/Dockerfile#L10
https://github.com/Security-Onion-Solutions/securityonion-image/blob/2.4/dev/so-strelka-backend/Dockerfile#L98C19-L114