fix: load custom modules by path (#6312)

What:
medusa-config.js loading custom modules by their path.

```typescript
{
  modules: {
    internalModule: {
      scope: MODULE_SCOPE.INTERNAL,
      resources: MODULE_RESOURCE_TYPE.SHARED,
      resolve: "./internal_module",
      definition: {
        key: "internalModule",
        registrationName: "internalModule",
      },
    },
  }
}
```

packages/modules-sdk/src/__mocks__/inventory-module.ts

@@ -5,7 +5,6 @@ export const InventoryModule = {
     defaultPackage: false,
     label: "InventoryService",
     isRequired: false,
-    canOverride: true,
     isQueryable: true,
     dependencies: [],
     defaultModuleDeclaration: {

packages/modules-sdk/src/__mocks__/inventory-stock-location-link.ts

@@ -4,7 +4,6 @@ export const InventoryStockLocationLink = {
     registrationName: "inventoryStockLocationLink",
     defaultPackage: "",
     label: "inventoryStockLocationLink",
-    canOverride: true,
     isRequired: false,
     isQueryable: true,
     defaultModuleDeclaration: {

packages/modules-sdk/src/__mocks__/product-inventory-link.ts

@@ -4,7 +4,6 @@ export const ProductInventoryLinkModule = {
     registrationName: "productVariantInventoryInventoryItemLink",
     defaultPackage: "",
     label: "productVariantInventoryInventoryItemLink",
-    canOverride: true,
     isRequired: false,
     isQueryable: true,
     defaultModuleDeclaration: {

packages/modules-sdk/src/__mocks__/product-module.ts

@@ -5,7 +5,6 @@ export const ProductModule = {
     defaultPackage: false,
     label: "ProductModuleService",
     isRequired: false,
-    canOverride: true,
     isQueryable: true,
     dependencies: ["eventBusModuleService"],
     defaultModuleDeclaration: {

packages/modules-sdk/src/__mocks__/stock-location-module.ts

@@ -5,7 +5,6 @@ export const StockLocationModule = {
     defaultPackage: false,
     label: "StockLocationService",
     isRequired: false,
-    canOverride: true,
     isQueryable: true,
     dependencies: ["eventBusService"],
     defaultModuleDeclaration: {