Standardize filenames to `helmrelease.yaml`

chart/templates/anchore/helmrelease.yaml

chart/templates/argocd/helmrelease.yaml

chart/templates/authservice/helmrelease.yaml

chart/templates/cluster-auditor/helmrelease.yaml

chart/templates/gatekeeper/helmrelease.yaml

chart/templates/gitlab-runner/helmrelease.yaml

chart/templates/haproxy/helmrelease.yaml

chart/templates/istio/controlplane/helmrelease.yaml

chart/templates/istio/operator/helmrelease.yaml

chart/templates/jaeger/helmrelease.yaml

chart/templates/logging/eck-operator/helmrelease.yaml

...t/templates/logging/elasticsearch-kibana/helmrelease.yaml

chart/templates/logging/fluentbit/helmrelease.yaml

chart/templates/logging/loki/helmrelease.yaml

chart/templates/logging/promtail/helmrelease.yaml

chart/templates/mattermost/mattermost/helmrelease.yaml

chart/templates/mattermost/operator/helmrelease.yaml

chart/templates/minio/minio-operator/helmrelease.yaml

chart/templates/minio/minio/helmrelease.yaml

chart/templates/monitoring/helmrelease.yaml