Add back some resource limits for operator

Fixes operator deployments:

```
Deployment.apps "pulumi-kubernetes-operator-controller-manager" is invalid: spec.template.spec.containers[0].resources.requests: Invalid value: "1G": must be less than or equal to memory limit of 128Mi
```

Fixes DACH-NY/cn-test-failures#4535

[static]

Signed-off-by: Martin Florian <martin.florian@digitalasset.com>

Author: martinflorian-da

cluster/expected/operator/expected.json

@@ -599,6 +599,10 @@
             "name": "docker-reg-cred"
           }
         ],
+        "limits": {
+          "cpu": 1,
+          "memory": "2G"
+        },
         "maxHistory": 10,
         "resources": {
           "requests": {

cluster/pulumi/operator/src/operator.ts

@@ -27,6 +27,10 @@ export const operator = new k8s.helm.v3.Release(
     version: '2.1.0',
     namespace: namespace.ns.metadata.name,
     values: {
+      limits: {
+        cpu: 1,
+        memory: config.optionalEnv('OPERATOR_MEMORY_LIMIT') || '2G',
+      },
       resources: {
         requests: {
           cpu: 0.2,