Hotfixes - Disable migrations implemented by #4190

[akolson]

Desired behavior

With the migration on https://github.com/learningequality/studio/issues/4190 now completed successfully, there is need to disable the migration on hotfixes so that they are not rerun when the code on the instance is updated. Also, merge down the changes in hotfixes into unstable for the same reason.

Current behavior

All migrations on hotfixes have been run successfully.

Value add

This will prevent redundant migrations from running, saving computational resources on environments.

Possible tradeoffs

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