* Updates GitHub Action for migrations
* Rubocop: Always `EnforcedShorthandSyntax` for hashes in the `migrations` directory
* Automatically load all available converter steps
* Enable YJIT at runtime, if available
* Progressbar shows skipped records and other small improvements
* Remove unused `report_progress_in_percent` option from step
* Remove `use_custom_progress_increment` option from the step because we can figure it out by looking at the progress
* Introduce `StepTracker` to for logging warnings and errors and tracking step progress
* Make it easier to log warnings and errors in all methods of `Step` without the need to pass around a `stats` object
