* 10575: Update black configs to stop it skipping migration files
This brings it into line with isort running on all things.
Note: removing the `migrations` dir from the exclusions will broaden the scope of other tools that pre-commit uses, but this makes sense as black and isort will be targetting these, so why not flake8 too?
* 10575: Apply updated Black config to Bedrock migrations
* 10575: Update git-blame history ignoring for previous commit