Release MongoDB Kubernetes Operator v0.8.0

[nammn]

Changes

    * Copy `CRD`s to Helm Chart
      - `cp config/crd/bases/mongodbcommunity.mongodb.com_mongodbcommunity.yaml helm-charts/charts/community-operator-crds/templates/mongodbcommunity.mongodb.com_mongodbcommunity.yaml`
      - commit changes to the [helm-charts submodule](https://github.com/mongodb/helm-charts) and create a PR against it ([similar to this one](https://github.com/mongodb/helm-charts/pull/163)).
      - do not merge helm-charts PR until release PR is merged and the images are pushed to quay.io.
   * bump operator version to 0.8.0

part of: https://github.com/mongodb/mongodb-kubernetes-operator/pull/1288

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