* populate site_imports from sites.imported_data in CE

* not dry_run?

* Wrap data migration using `with_repo` to ensure ClickhouseRepo is running

* Do not create funnels in seeds when running CE

* Remove migrator wrapper

* Explicitly raise on rollback attempt

* Put a warning in data migration scripts which are put in migrations

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Co-authored-by: Adrian Gruntkowski <adrian.gruntkowski@gmail.com>