Continued from RHIDP-8890, but for the WIP plugin catalog index.

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To facilitate the question "for which RHDH 1.y.z and backstage 1.yy.z versions are this container for?"

we should include two new env vars in the Containerfiles for the hub, operator, bundle, plugin catalog index, and each plugin artifact too.

Thread: https://redhat-internal.slack.com/archives/C05HGAR2DT5/p1757607920937979?thread_ts=1757606161.744149&cid=C05HGAR2DT5

See discussion in https://issues.redhat.com/browse/RHIDP-8890?focusedId=28207025&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-28207025