Replace ctaeos pod with EOS Helm chart

This issue is to keep track of the replacement of the existing ctaeos pod with the EOS Helm chart

The idea is to first stop the ctaeos pod from spawning. Instead, we will install the EOS Helm chart. The pods spawned by this chart will need to be configured in such a way that the CTA deployment can talk with it. This includes authentication and setting some EOS attributes (and maybe more; to be documented).

Once this is worked, all of the EOS-related things will be ripped out of the orchestration setup (and Dockerfile) and the CTA deployment and we will be purely relying on the EOS Helm chart.