feat(medusa): migrate medusa unit tests / plugins integration tests to swc jest (#6820)

what:

- migrates medusa package to swc/jest
- migrates plugins integration tests to swc/jest
- parallelises a few of the heavy test packages
- fixes typeorm circular dependencies

**Unit Tests**

Before: 1 job => ~30 mins
After: 2 jobs => ~5 mins


<img width="260" alt="Screenshot 2024-03-25 at 15 11 49" src="https://github.com/medusajs/medusa/assets/5105988/e1df6985-5bd6-48d0-b87b-336d3c77d0cf">

**Plugins**

Before: 1 job => ~10 mins
After: 1 job => ~5 mins

<img width="254" alt="Screenshot 2024-03-25 at 15 26 03" src="https://github.com/medusajs/medusa/assets/5105988/c1cec0e2-a1c3-41d1-9372-46d114d804c6">



Co-authored-by: Adrien de Peretti <25098370+adrien2p@users.noreply.github.com>

integration-tests/plugins/__tests__/inventory/order/order.js

@@ -178,7 +178,7 @@ describe("/store/carts", () => {
         })
 
         const customer = await simpleCustomerFactory(dbConnection, {}, 100)
-
+        const items = []
         const cart = await simpleCartFactory(dbConnection, {
           email: "testme@email.com",
           region: regionId,
@@ -194,7 +194,6 @@ describe("/store/carts", () => {
           ],
         })
 
-        const items = []
         for (let i = 0; i < 13; i++) {
           const product = await simpleProductFactory(dbConnection, {})
           await prodVarInventoryService.attachInventoryItem(