Clean up recently ran migrations

[ozer550]

Summary

Removes recently added migrations

Description of the change(s) you made

• Removes command for migration.
• Removes related tests.

References

closes #4777

Contributor's Checklist

PR process:

• [ ] If this is an important user-facing change, PR or related issue the CHANGELOG label been added to this PR. Note: items with this label will be added to the CHANGELOG at a later time
• [ ] If this includes an internal dependency change, a link to the diff is provided
• [ ] The docs label has been added if this introduces a change that needs to be updated in the user docs?
• [ ] If any Python requirements have changed, the updated requirements.txt files also included in this PR
• [ ] Opportunities for using Google Analytics here are noted
• [ ] Migrations are safe for a large db

Studio-specifc:

• [ ] All user-facing strings are translated properly
• [ ] The notranslate class been added to elements that shouldn't be translated by Google Chrome's automatic translation feature (e.g. icons, user-generated text)
• [ ] All UI components are LTR and RTL compliant
• [ ] Views are organized into pages, components, and layouts directories as described in the docs
• [ ] Users' storage used is recalculated properly on any changes to main tree files
• [ ] If there new ways this uses user data that needs to be factored into our Privacy Policy, it has been noted.

Testing:

• [ ] Code is clean and well-commented
• [ ] Contributor has fully tested the PR manually
• [ ] If there are any front-end changes, before/after screenshots are included
• [ ] Critical user journeys are covered by Gherkin stories
• [ ] Any new interactions have been added to the QA Sheet
• [ ] Critical and brittle code paths are covered by unit tests

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Reviewer's Checklist

This section is for reviewers to fill out.

• [ ] Automated test coverage is satisfactory
• [ ] PR is fully functional
• [ ] PR has been tested for accessibility regressions
• [ ] External dependency files were updated if necessary (yarn and pip)
• [ ] Documentation is updated
• [ ] Contributor is in AUTHORS.md