**What**
- Admin sales channels API routes
- Workflows for creating, updating, and deleting sales channels
- Align `ISalesChannelModuleService` interface with update + upsert conventions
- Integrate v2 tests into v1 sales channels integration test suite
- Add metadata to sales channel entity
Sales channel <> Product management will come in a follow-up PR.
On the integration tests, creating, updating, and deleting are passing with the V2 flag enabled. You'll have to take my word for it (or run them yourself), as they are not included in the CI.
**What**
> [!NOTE]
> I can see this pr becoming huge, so I d like to get this partial one merged 👍
- Fixes shared connection usage (mikro orm compare the instance to its own package and therefore was resulting in not trully reusing the provided connection leading to exhausting the connection pool as multiple connections was created and end up not being all destroyed properly under the hood, discovered in my integration tests)
- Create shipping options method implementation
- DTO's definition and service interface update
- integration tests
- Re work of the indexes with new util update
- Test runner utils to remove a big chunk of the boilerplate of the packages integrations
FIXES CORE-1742
