MCO-1957: OSImageStream gathering from ReleaseImage

[pablintino]

- What I did

- How to verify it

- Description for the changelog

[openshift-ci-robot]

@pablintino: This pull request references MCO-1957 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the spike to target the "4.21.0" version, but no target version was set.

In response to this:

- What I did

- How to verify it

- Description for the changelog

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[openshift-ci]

Skipping CI for Draft Pull Request.
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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pablintino

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[openshift-merge-robot]

PR needs rebase.

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