cmd/k8s-operator: add exit node example (#18087)

* cmd/k8s-operator/deploy/examples

Adds exitnode.yaml to k8s-operator

Fixes #18086

Signed-off-by: Christopher Mosetick <office@cpm.is>

* cmd/k8s-operator/deploy/examples: update connector and add exitnode examples
- Remove exitNode: true from connector.yaml to keep it focused as a subnet router example
- Update connector.yaml header comment to remove exit node reference and add pointer hint to exitnode.yaml
- Clarify exitnode.yaml comments to accurately describe separate Connector deployment pattern

Fixes #18086

Signed-off-by: Christopher Mosetick <office@cpm.is>

* Update cmd/k8s-operator/deploy/examples/exitnode.yaml

Co-authored-by: David Bond <davidsbond@users.noreply.github.com>
Signed-off-by: Chris Mosetick <cmosetick@gmail.com>

* Update cmd/k8s-operator/deploy/examples/exitnode.yaml

Co-authored-by: David Bond <davidsbond@users.noreply.github.com>
Signed-off-by: Chris Mosetick <cmosetick@gmail.com>

* Update cmd/k8s-operator/deploy/examples/exitnode.yaml

Co-authored-by: David Bond <davidsbond@users.noreply.github.com>
Signed-off-by: Chris Mosetick <cmosetick@gmail.com>

* Update cmd/k8s-operator/deploy/examples/exitnode.yaml

Co-authored-by: David Bond <davidsbond@users.noreply.github.com>
Signed-off-by: Chris Mosetick <cmosetick@gmail.com>

---------

Signed-off-by: Christopher Mosetick <office@cpm.is>
Signed-off-by: Chris Mosetick <cmosetick@gmail.com>
Co-authored-by: David Bond <davidsbond@users.noreply.github.com>

cmd/k8s-operator/deploy/examples/connector.yaml

@@ -1,9 +1,10 @@
 # Before applying ensure that the operator owns tag:prod.
 # https://tailscale.com/kb/1236/kubernetes-operator/#setting-up-the-kubernetes-operator.
-# To set up autoapproval set tag:prod as approver for 10.40.0.0/14 route and exit node.
+# To set up autoapproval set tag:prod as approver for 10.40.0.0/14 route.
 # Otherwise approve it manually in Machines panel once the
 # ts-prod Tailscale node has been created.
 # See https://tailscale.com/kb/1018/acls/#auto-approvers-for-routes-and-exit-nodes
+# For an exit node example, see exitnode.yaml
 apiVersion: tailscale.com/v1alpha1
 kind: Connector
 metadata:
@@ -17,4 +18,3 @@ spec:
     advertiseRoutes:
     - "10.40.0.0/14"
     - "192.168.0.0/14"
-  exitNode: true