Chart broken for kubernetes 1.19

For kubernetes 1.19, both extensions/v1beta1 and networking.k8s.io/v1 coexist so this approach in fact breaks this helm chart since we end up with apiVersion: extensions/v1beta1 here but also hit the {{- if $.Capabilities.APIVersions.Has "networking.k8s.io/v1" }} conditional below producing the following error:

Error: unable to build kubernetes objects from release manifest: error validating "": error validating data: ValidationError(Ingress.spec.rules[0].http.paths[0].backend): unknown field "service" in io.k8s.api.networking.v1beta1.IngressBackend
helm.go:88: [debug] error validating "": error validating data: ValidationError(Ingress.spec.rules[0].http.paths[0].backend): unknown field "service" in io.k8s.api.networking.v1beta1.IngressBackend

Originally posted by @jsotelo in https://github.com/actions-runner-controller/actions-runner-controller/pull/988#discussion_r779635311

Start with the Helm chart's Ingress template and inspect the apiVersion selection alongside the Capabilities.APIVersions.Has conditional mentioned in the report. Render or install the chart against Kubernetes 1.19 and verify that the generated Ingress uses fields valid for its selected API version; done means the release manifest validates successfully.