fix(inventory): delete reservation item inventory level required quantity (#13633)

Fixes #13625


---

> [!NOTE]
> Ensure `reserved_quantity` is adjusted when deleting reservation items via `deleteReservationItems`, with new integration tests covering deletion and inventory updates.
> 
> - **Inventory Module Service (`packages/modules/inventory/src/services/inventory-module.ts`)**:
>   - Add `deleteReservationItems` API (and transactional `_` variant) that hard-deletes reservations, then updates related inventory levels via `adjustInventoryLevelsForReservationsDeletion`.
>   - Wire through event emission/manager decorators consistent with existing patterns.
> - **Integration Tests (`packages/modules/inventory/integration-tests/__tests__/inventory-module-service.spec.ts`)**:
>   - Add tests for `deleteReservationItems` to verify deletion by id and `reserved_quantity` adjustments on inventory levels.
>   - Minor import update to include `ReservationItemDTO`.
> - **Changeset**:
>   - Patch release note for `@medusajs/inventory` documenting the fix.
> 
> <sup>Written by [Cursor Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit ac6641a9ec9543115504407f708f81bd427c3444. This will update automatically on new commits. Configure [here](https://cursor.com/dashboard?tab=bugbot).</sup>

packages/modules/inventory/src/services/inventory-module.ts

@@ -711,6 +711,32 @@ export default class InventoryModuleService
     return result
   }
 
+  @InjectManager()
+  @EmitEvents()
+  // @ts-expect-error
+  async deleteReservationItems(
+    ids: string | string[],
+    @MedusaContext() context: Context = {}
+  ): Promise<void> {
+    return await this.deleteReservationItems_(ids, context)
+  }
+
+  @InjectTransactionManager()
+  protected async deleteReservationItems_(
+    ids: string | string[],
+    @MedusaContext() context: Context = {}
+  ): Promise<void> {
+    const reservations: InventoryTypes.ReservationItemDTO[] =
+      await this.reservationItemService_.list({ id: ids }, {}, context)
+
+    await super.deleteReservationItems(ids, context)
+
+    await this.adjustInventoryLevelsForReservationsDeletion(
+      reservations,
+      context
+    )
+  }
+
   @InjectManager()
   @EmitEvents()
   // @ts-expect-error