Query DNS before finalizing cloud instances

[michaeljguarino]

There's some lag to externaldns registering for an ingress that could cause user-facing goofiness, just query dns until it resolves to wait for that to dissipate.

Test Plan

existing test still works

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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