* wip: validate line item SC
* fix: repository type, remove relation, use sc id, check if cart has associated sc
* feat: setup tests and seeder, change entity retrieval in cart service method
* feat: remove repo usage and method, use Adrien's method from product service to check sc association, add test cases, add seeder entities, accept flag for validating sc on the endpoint
* feat: add a unit test to ensure validation method is called if flag is passed
* feat: allow `validate_sales_channels` flag in other relevant endpoints
* fix: typo
* fix: flag rename
* fix: correct FF in test suites
* fix: address PR feedback
* fix: change error message
* feat: remove query params, guard with FF, refactor
* feat: guard validation in the service
* refactor: rename validation method
* refactor: reorganise tests
* wip: cleanup test file
* wip: revert cart seeder changes use factories
* fix: remove seeder, update mocks
* fix: method name
* fix: units, validate by default
* git: resolve merge conflicts
* refactor: separate line item sales chanel units
Co-authored-by: fPolic <frane@medusajs.com>
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