feat: Pricing update and refactor product API tests to not rely on internals (#6892)

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

packages/types/src/product/common.ts

@@ -673,7 +673,7 @@ export interface ProductOptionValueDTO {
  * @prop handle - The handles to filter products by.
  * @prop id - The IDs to filter products by.
  * @prop tags - Filters on a product's tags.
- * @prop categories - Filters on a product's categories.
+ * @prop category_id - Filters on a product's category_id.
  * @prop collection_id - Filters a product by its associated collections.
  */