fix: DML relation management for many to one relation ship foreign keys (#7790)

FIXES CORE-2369

cc @thetutlage 

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/core/utils/src/modules-sdk/index.ts

@@ -13,3 +13,4 @@ export * from "./medusa-internal-service"
 export * from "./medusa-service"
 export * from "./migration-scripts"
 export * from "./mikro-orm-cli-config-builder"
+

packages/core/utils/src/modules-sdk/mikro-orm-cli-config-builder.ts

@@ -1,8 +1,12 @@
 import { MikroORMOptions } from "@mikro-orm/core/utils/Configuration"
 import { DmlEntity, toMikroORMEntity } from "../dml"
 import { TSMigrationGenerator } from "../dal"
-import { AnyEntity, EntityClassGroup, EntitySchema } from "@mikro-orm/core"
-import { EntityClass } from "@mikro-orm/core/typings"
+import type {
+  AnyEntity,
+  EntityClass,
+  EntityClassGroup,
+} from "@mikro-orm/core/typings"
+import type { EntitySchema } from "@mikro-orm/core/metadata/EntitySchema"
 
 type Options = Partial<MikroORMOptions> & {
   entities: (