Filter upgrade notifications on users with active clusters

[michaeljguarino]

Summary

We don't want to send these for stale users as it would just be spam.

Test Plan

unit test fixups

Checklist

• [ ] If required, I have updated the Plural documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] I have added a meaningful title and summary to convey the impact of this PR to a user.
• [ ] I have added relevant labels to this PR to help with categorization for release notes.

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graphql-test-results	Visit	32ff2ce8301093e9948d96740dd664863794887d	✅

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