This PR achieves the following
- Remove dependency on internals for seeding the tests (more work left, but major work done)
- Adds the workflow for updating variant's price
I will do a follow-up PR to further clean up the tests and remove all internal dependencies
Things that remain to be done:
1. Handle product and variant updates
2. Add tests for the workflows independently
3. Align the endpoints to the new code conventions we defined
4. Finish up the update/upsert endpoints for variants
All of those can be done in a separate PR, as this is quite large already.
