[stable] RHOAIENG-9935: feat(nbcs): get ose-oauth-proxy image with PullIfNeeded policy and use digest to specify the image

[openshift-cherrypick-robot]

This is an automated cherry-pick of #374

/assign jiridanek

[openshift-ci]

Hi @openshift-cherrypick-robot. Thanks for your PR.

I'm waiting for a opendatahub-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jstourac]

/lgtm

[jiridanek]

/lgtm

[harshad16]

/approve

thanks 👍

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: harshad16

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