Pass tolerations through to cost analyzer checks

[michaelmdresser]

Addresses #758

Testing

Set the following in cost-analyzer/values.yaml:

tolerations:
  - key: "testtaint"
    operator: "Equal"
    value: "testvalue"
    effect: "NoSchedule"

Ran one deployment before the change, ran one deployment after the change.

Before the change, a checks pod had the following (from kubectl describe:

Tolerations:     node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                 node.kubernetes.io/unreachable:NoExecute op=Exists for 300s

After the change, a checks pod had the following:

Tolerations:     node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                 node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
                 testtaint=testvalue:NoSchedule