[PRERELEASE] Support SSH reruns [RT-1201]

[christian-stephen]

Jira ticket: https://circleci.atlassian.net/browse/RT-1201

Background

During a Hack Week initiative, work was done that leveraged the new Kubernetes Gateway API resources to support SSH reruns on container runner. Some of the barriers to our earlier attempts and designs of supporting SSH reruns on container runner were limitations of existing Kubernetes Ingresses, which are HTTP-specific and have limited routing capabilities to specific pods (an unusual pattern, but a necessity for SSH).

Note that these Helm chart updates are interdependent on PR https://github.com/circleci/circleci-runner/pull/478

Changes

• Add the necessary Kubernetes Gateway API resources for SSH reruns to the Helm chart
• Expose the necessary configuration parameters for SSH in the values file (note that SSH is fully opt-in, and nothing additional will be installed to the cluster if disabled)

Testing

• Add various Helm unit tests testing the installation and configuration of Gateway API resources when SSH reruns are enabled
• Demo video using the Envoy Gateway implementation on GKE:

246161830-71180148-5462-44ac-be3f-a05da58affc0.webm