DM-45138: Move PostgreSQL URL manipulation into type #216
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Create a new EnvAsyncPostgresDsn type that modifies the URL based on environment variable settings set by tox-docker, avoiding the need for an explicit validator and making it easier to lift this code into Safir.
Due to a bug in the type system of Pydantic, this does not work in conjunction with the pattern to convert URLs into strings, so undo that change and keep the URL as a Pydantic MultiHostUrl object. This requires explicitly converting it to a string in a few places.