Updates coder/customers#365
This PR updates our migration framework to run all migrations in a single transaction. This is the same behavior we had in v1 and ensures that failed migrations don't bring the whole deployment down. If a migration fails now, it will automatically be rolled back to the previous version, allowing the deployment to continue functioning.
* chore: rename startup logs to agent logs
This also adds a `source` property to every agent log. It
should allow us to group logs and display them nicer in
the UI as they stream in.
* Fix migration order
* Fix naming
* Rename the frontend
* Fix tests
* Fix down migration
* Match enums for workspace agent logs
* Fix inserting log source
* Fix migration order
* Fix logs tests
* Fix psql insert
