fix(): Deleted default sales channel should be prevented (#10193)

FIXES CMRC-722

**What**
- It should not be allowed to delete a default sales channel
- The admin does not allow to delete a sales channel use as the default for the store

packages/core/core-flows/src/sales-channel/steps/can-delete-sales-channels.ts

@@ -0,0 +1,36 @@
+import { createStep, StepResponse } from "@medusajs/framework/workflows-sdk"
+
+import { MedusaError, Modules } from "@medusajs/framework/utils"
+export const canDeleteSalesChannelsOrThrowStepId =
+  "can-delete-sales-channels-or-throw-step"
+
+export const canDeleteSalesChannelsOrThrowStep = createStep(
+  canDeleteSalesChannelsOrThrowStepId,
+  async ({ ids }: { ids: string | string[] }, { container }) => {
+    const salesChannelIdsToDelete = Array.isArray(ids) ? ids : [ids]
+
+    const storeModule = await container.resolve(Modules.STORE)
+
+    const stores = await storeModule.listStores(
+      {
+        default_sales_channel_id: salesChannelIdsToDelete,
+      },
+      {
+        select: ["default_sales_channel_id"],
+      }
+    )
+
+    const defaultSalesChannelIds = stores.map((s) => s.default_sales_channel_id)
+
+    if (defaultSalesChannelIds.length) {
+      throw new MedusaError(
+        MedusaError.Types.INVALID_DATA,
+        `Cannot delete default sales channels: ${defaultSalesChannelIds.join(
+          ", "
+        )}`
+      )
+    }
+
+    return new StepResponse(true)
+  }
+)

packages/core/core-flows/src/sales-channel/steps/index.ts

@@ -6,3 +6,4 @@ export * from "./detach-products-from-sales-channels"
 export * from "./update-sales-channels"
 export * from "./associate-locations-with-channels"
 export * from "./detach-locations-from-channels"
+export * from "./can-delete-sales-channels"

packages/core/core-flows/src/sales-channel/workflows/delete-sales-channels.ts

@@ -7,6 +7,7 @@ import {
 import { emitEventStep } from "../../common"
 import { removeRemoteLinkStep } from "../../common/steps/remove-remote-links"
 import { deleteSalesChannelsStep } from "../steps/delete-sales-channels"
+import { canDeleteSalesChannelsOrThrowStep } from "../steps"
 
 export type DeleteSalesChannelsWorkflowInput = { ids: string[] }
 
@@ -19,6 +20,7 @@ export const deleteSalesChannelsWorkflow = createWorkflow(
   (
     input: WorkflowData<DeleteSalesChannelsWorkflowInput>
   ): WorkflowData<void> => {
+    canDeleteSalesChannelsOrThrowStep({ ids: input.ids })
     deleteSalesChannelsStep(input.ids)
 
     removeRemoteLinkStep({