Fixes #19349
This reverts commit 3f636386a6
(https://github.com/element-hq/synapse/pull/19268) as the DB migration
was taking too long and blocking media access while it happened.
See https://github.com/element-hq/synapse/issues/19349 for further
information.
### Pull Request Checklist
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* [X] [Code
style](https://element-hq.github.io/synapse/latest/code_style.html) is
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[linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))
---------
Co-authored-by: Travis Ralston <travpc@gmail.com>
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