Fix cloud instance validations

[michaeljguarino]

• off by one on the regex
• create instance first so its uniq constraints fire first

Test Plan

existing

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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