Allow manager replicas to be configured via helm chart

Enable custom pod labels for helm chart (grafana#326)

* Update template to include podLabels

* Include podLabels annotation in values file

* Bump chart version

* Include helm templating for pod labels

* Requested Feedback

feat: use clusterip instead of DNS for service status check

update versions; docs: add Helm instructions

ci: fix typo in workflow

Update kind-action

ci: update token for helm releases

helm: add TestRun CRD to templates

ci: add missing step in helm test

fix: Use proper notation for nodeSelector definition

Signed-off-by: Jorge Turrado <[email protected]>