Stop hosting mongo in gcr.io/kubeflow-images-public/mongo:3.4

[jlewi]

The only reference to the image in

kubeflow/scripts/gke/use_gcr_for_all_images.sh

Line 37 in 76107ff

ks param set katib modeldbDatabaseImage gcr.io/kubeflow-images-public/mongo:3.4

https://github.com/kubeflow/kubeflow/search?q=mongo&unscoped_q=mongo

We copied it kubeflow-images-public as a convenience for people who were using private GKE clusters; dockerhub wouldn't be available in this case.

If users need mongo e.g. for ModelDB then replicate it to their own private GCR.

[jlewi]

We have a single image:

{
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   "config": {
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      "digest": "sha256:5e8257ef570b0b906b91dd6ffc1c10da28b1ab6021ead9244da49ebee9568502"
   },
   "layers": [
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         "digest": "sha256:5bba3ecb4cd6374a19da45f2a3db0a9c0804984358b3bb4b666c28944016e5ff"
      },
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         "digest": "sha256:c9f47d82692cde614aa658782984a01c5130c4a7d2a1232bf8c0d4c42bd0ba2f"
      },
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         "digest": "sha256:81f0d5fb46e98fdecbafa723d293d1c69fef8e6858254fb8448babf196a88ba6"
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}