feat: stabilize tailscale observability exposure with declarative proxy class

ansible/roles/tailscale-operator/templates/proxyclass.yaml.j2

@@ -0,0 +1,17 @@
+apiVersion: tailscale.com/v1alpha1
+kind: ProxyClass
+metadata:
+  name: {{ tailscale_proxyclass_name }}
+spec:
+  statefulSet:
+    pod:
+      nodeSelector:
+{% for key, value in tailscale_operator_node_selector.items() %}
+        {{ key }}: "{{ value }}"
+{% endfor %}
+      tolerations:
+{% for tol in tailscale_operator_tolerations %}
+      - key: "{{ tol.key }}"
+        operator: "{{ tol.operator }}"
+        effect: "{{ tol.effect }}"
+{% endfor %}