Add subaccount usernames table to list of tables to export. (backport #2677)

[mergify]

Changelist

Add DDL for subaccount usernames table to research env export task.

Test Plan

N/A

Author/Reviewer Checklist

• If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
• If the PR has breaking postgres changes to the indexer add the indexer-postgres-breaking label.
• If this PR isn't state-breaking but has changes that modify behavior in PrepareProposal or ProcessProposal, manually add the label proposal-breaking.
• If this PR is one of many that implement a specific feature, manually label them all feature:[feature-name].
• If you wish to for mergify-bot to automatically create a PR to backport your change to a release branch, manually add the label backport/[branch-name].
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Summary by CodeRabbit

• New Features

  • Added support for generating Athena table creation statements for subaccount usernames.
  • Expanded table creation capabilities in the research environment update process.

• Chores

  • Integrated new module for handling subaccount username table definitions.

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This is an automatic backport of pull request #2677 done by [Mergify](https://mergify.com).

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