* ctb, testmig: Add migration test script, migration dictator cleanups

Adds a Python script to test the migration end-to-end. Currently, it will:

1. Download a DTL and L2Geth archive from GCS
2. Spin up a forked L1
3. Set state slots so that the deployer owns the legacy system
4. Perform the migration

Also includes some fixes to make the migration dictator work, there were a couple of small changes that still needed to be implemented.

* bindings: regenerate

* update deploy configs

* bindingz