Add get_code_version to DagsterDbtTranslator

[Grzyblon]

Summary & Motivation

I wanted to use AutomationCondition.code_version_changed with dbt seeds. Unfortunately, from what I was able to determine, code_version is not set for seeds. Or maybe I should say it is, but all seeds have same value because function default_code_version_fn, that is used as a default, sets it based on “raw_sql” or “raw_code” from dbt_resource_props and what I saw for seeds, value of those is an empty string. That wouldn’t be a problem if there was a function like get_code_version in DagsterDbtTranslator that one can override. I didn’t find any open issue on that topic, so I decided to try to implement that.

It’s the first time I’m contributing to any open-source project. I tried to do my best to comply to any standards I could find so please be understanding 😊

How I Tested These Changes

I’ve added unit tests similar to other properties override by DagsterDbtTranslator like group_names in unit test test_with_group_replacements of test_asset_decorator.py module.

Changelog

Allow DagsterDbtTranslator to customize code_version