chart: Add default-logs-container annotation to controller pods

so that you can run `kubectl logs` on controller pods without the specifying the container name.

It is especially useful when you want to run kubectl-logs on all ARC pods across controller-manager and github-webhook-server like:

```
kubectl -n actions-runner-system logs -l app.kubernetes.io/name=actions-runner-controller
```

That was previously impossible due to that the selector matches pods from both controller-manager and github-webhook-server and kubectl does not provide a way to specify container names for respective pods.

charts/actions-runner-controller/templates/deployment.yaml

@@ -14,6 +14,7 @@ spec:
     metadata:
       {{- with .Values.podAnnotations }}
       annotations:
+        kubectl.kubernetes.io/default-logs-container: "manager"
         {{- toYaml . | nindent 8 }}
       {{- end }}
       labels:

charts/actions-runner-controller/templates/githubwebhook.deployment.yaml

@@ -15,6 +15,7 @@ spec:
     metadata:
       {{- with .Values.githubWebhookServer.podAnnotations }}
       annotations:
+        kubectl.kubernetes.io/default-logs-container: "github-webhook-server"
         {{- toYaml . | nindent 8 }}
       {{- end }}
       labels: