Add rake tasks to update expectations for some local transactions

Tasks to:
  - Add 'Available in Wales only' Expectation
  - Update LocalTransactionEditions with expectations 'Available in England only' to use the expectation 'Available in England and Wales only'
Assert that other LocalTransactionEditions aren't affected by task
Make a migration for the expectations update tasks
Merge remote-tracking branch 'origin/update_local_transaction_expectations'