[Discuss] Elastic Agent Helm Chart release process

In https://github.com/elastic/elastic-agent/pull/5331, we added a Helm Chart for Elastic Agent.  At the time, we [deferred](https://github.com/elastic/elastic-agent/pull/5331#discussion_r1742638157) the discussion on how this chart should be released.  Let's continue the discussion in this issue and try to arrive at a decision.