Docs: Add Option for Extensions Components to use Host Network and Configure Ports

[markmandel]

Wrap up work from #3895

Basically this PR was required for Cillium on EKS - we got the functionality merged but no docs.

We should have documentation for the new helm fields here:
https://agones.dev/site/docs/installation/install-agones/helm/

And also an update to our EKS guide:
https://agones.dev/site/docs/installation/creating-cluster/eks/

[markmandel]

@Orza are you able to write these docs so we can wrap up this work please?

[Orza]

@Orza are you able to write these docs so we can wrap up this work please?

yes, sure

[markmandel]

https://agones.dev/site/docs/contribute/ has details on how to hide new content and how to preview locally.