bug: control plane replicas are duplicated

here is the query:

```
count(up{pod=~`coder.*`, pod!~`.*provisioner.*`, namespace=`oss`} == 1) or vector(0)
```

it returns 6 replicas despite 3 being deployed. this is because each replica has two matching labels:

```
app.kubernetes.io/instance=coder
app.kubernetes.io/name=coder
```