chore: remove the leftovers of the act runner deployment

`scripts/act_runner/token.sh` bootstrapped the registration token of an act runner by patching a Kubernetes Secret
with kubectl. The deployment it belonged to is long gone, and no glob picked the file up either: the chart only ships
`scripts/init-containers/config/*.sh` and `scripts/init-containers/init/*.sh`, so the script was not even part of the
packaged chart.

The label helpers `gitea.labels.actRunner` and `gitea.selectorLabels.actRunner` were orphaned the same way. The former
is referenced by no template at all and the latter only by the former, which left them as a closed loop without an
entry point.

Co-authored-by: Copilot <copilot@github.com>

templates/_helpers.tpl

@@ -166,15 +166,6 @@ version: {{ .Values.deployment.gitea.image.tag | default .Chart.AppVersion | quo
 app.kubernetes.io/managed-by: {{ .Release.Service }}
 {{- end -}}
 
-{{- define "gitea.labels.actRunner" -}}
-helm.sh/chart: {{ include "gitea.chart" . }}
-app: {{ include "gitea.name" . }}-act-runner
-{{ include "gitea.selectorLabels.actRunner" . }}
-app.kubernetes.io/version: {{ .Values.deployment.gitea.image.tag | default .Chart.AppVersion | quote }}
-version: {{ .Values.deployment.gitea.image.tag | default .Chart.AppVersion | quote }}
-app.kubernetes.io/managed-by: {{ .Release.Service }}
-{{- end -}}
-
 {{/*
 Selector labels
 */}}
@@ -183,11 +174,6 @@ app.kubernetes.io/name: {{ include "gitea.name" . }}
 app.kubernetes.io/instance: {{ .Release.Name }}
 {{- end -}}
 
-{{- define "gitea.selectorLabels.actRunner" -}}
-app.kubernetes.io/name: {{ include "gitea.name" . }}-act-runner
-app.kubernetes.io/instance: {{ .Release.Name }}
-{{- end -}}
-
 {{- define "postgresql-ha.dns" -}}
 {{- if (index .Values "postgresql-ha").enabled -}}
 {{- printf "%s-postgresql-ha-pgpool.%s.svc.%s:%g" .Release.Name .Release.Namespace .Values.clusterDomain (index .Values "postgresql-ha" "service" "ports" "postgresql") -}}