Allow the Cluster-Autoscaler to evict blobserve

[meysholdt]

Fixes #3389

[csweichel]

LGTM

[fullmetalrooster]

The same happens with when image-builder is running in the node.

{
  "insertId": "005102e8-38c3-4094-80df-746973205224@a1",
  "jsonPayload": {
    "noDecisionStatus": {
      "noScaleDown": {
        "nodesTotalCount": 1,
        "nodes": [
          {
            "node": {
              "name": "gke-prod--gitpod-io--workspace-pool-0-5850a154-gzb4",
              "mig": {
                "zone": "europe-west1-d",
                "nodepool": "workspace-pool-0",
                "name": "gke-prod--gitpod-io--workspace-pool-0-5850a154-grp"
              },
              "cpuRatio": 5,
              "memRatio": 13
            },
            "reason": {
              "parameters": [
                "image-builder-864fb97db6-85jjk"
              ],
              "messageId": "no.scale.down.node.pod.has.local.storage"
            }
          }
        ]
      },
      "measureTime": "1614995355"
    }
  },
  "resource": {
    "type": "k8s_cluster",
    "labels": {
      "cluster_name": "prod--gitpod-io--europe-west1--03",
      "project_id": "gitpod-191109",
      "location": "europe-west1"
    }
  },
  "timestamp": "2021-03-06T01:49:15.933553279Z",
  "logName": "projects/gitpod-191109/logs/container.googleapis.com%2Fcluster-autoscaler-visibility",
  "receiveTimestamp": "2021-03-06T01:49:16.227175872Z"
}

https://console.cloud.google.com/logs/query...