Add legacy boolean to clusters

[michaeljguarino]

Summary

Will be set from consoles on registration, at the very least we can ensure new console's set it to false

Test Plan

unit

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.

[linear]

PROD-2581 add legacy flag to clusters table

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email-test-results	Visit	1408f9e	✅
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