fix(core-flows, dashboard): adjust stock levels when doing partial fulfilments (#9736)

* fix: correctly update stock location when partial fulfillemnt is created

* fix: update test

* fix: count reserved quantity of the item as available quantity for fulfillment

* fix: refresh reservations when order fulfillment is created

* feat: add check for reservation quantity

* feat: add a test case

integration-tests/http/__tests__/fixtures/order.ts

@@ -22,7 +22,7 @@ export async function createOrderSeeder({
   container: MedusaContainer
   productOverride?: AdminProduct
   stockChannelOverride?: AdminStockLocation
-  additionalProducts?: AdminProduct[]
+  additionalProducts?: { variant_id: string; quantity: number }[]
   inventoryItemOverride?: AdminInventoryItem
 }) {
   const publishableKey = await generatePublishableKey(container)
@@ -195,10 +195,7 @@ export async function createOrderSeeder({
         sales_channel_id: salesChannel.id,
         items: [
           { quantity: 1, variant_id: product.variants[0].id },
-          ...(additionalProducts || []).map((p) => ({
-            quantity: 1,
-            variant_id: p.variants?.[0]?.id,
-          })),
+          ...(additionalProducts || []),
         ],
       },
       storeHeaders