chore(): Fix database test utils and utils (#6383)

**What**
Fix the test utils database to trully run the migrations, the migration path is deprecated and not used anymore as umzung infer the path under the hood. It also fix the schema so that it is possible to specify different schema if needed.

The index helper can now create named constraints for uniqueness. 

extracted [from](https://github.com/medusajs/medusa/pull/6381)

packages/medusa-test-utils/src/database.ts

@@ -1,6 +1,6 @@
-import { TSMigrationGenerator } from "@mikro-orm/migrations"
 import { MikroORM, Options, SqlEntityManager } from "@mikro-orm/postgresql"
 import * as process from "process"
+import { Migrator } from "@mikro-orm/migrations"
 
 export function getDatabaseURL(): string {
   const DB_HOST = process.env.DB_HOST ?? "localhost"
@@ -15,7 +15,8 @@ export function getDatabaseURL(): string {
 
 export function getMikroOrmConfig(
   mikroOrmEntities: any[],
-  pathToMigrations: string
+  pathToMigrations: string, // deprecated, auto inferred
+  schema?: string
 ): Options {
   const DB_URL = getDatabaseURL()
 
@@ -23,23 +24,17 @@ export function getMikroOrmConfig(
     type: "postgresql",
     clientUrl: DB_URL,
     entities: Object.values(mikroOrmEntities),
-    schema: process.env.MEDUSA_DB_SCHEMA,
+    schema: schema ?? process.env.MEDUSA_DB_SCHEMA,
     debug: false,
-    migrations: {
-      path: pathToMigrations,
-      pathTs: pathToMigrations,
-      glob: "!(*.d).{js,ts}",
-      silent: true,
-      dropTables: true,
-      transactional: true,
-      allOrNothing: true,
-      safe: false,
-      generator: TSMigrationGenerator,
-    },
+    extensions: [Migrator],
   }
 }
 
 export interface TestDatabase {
+  mikroOrmEntities: any[]
+  pathToMigrations: any // deprecated, auto inferred
+  schema?: string
+
   orm: MikroORM | null
   manager: SqlEntityManager | null
 
@@ -52,9 +47,14 @@ export interface TestDatabase {
 
 export function getMikroOrmWrapper(
   mikroOrmEntities: any[],
-  pathToMigrations: string
+  pathToMigrations: string, // deprecated, auto inferred
+  schema?: string
 ): TestDatabase {
   return {
+    mikroOrmEntities,
+    pathToMigrations, // deprecated, auto inferred
+    schema: schema ?? process.env.MEDUSA_DB_SCHEMA,
+
     orm: null,
     manager: null,
 
@@ -83,18 +83,36 @@ export function getMikroOrmWrapper(
     },
 
     async setupDatabase() {
-      const OrmConfig = getMikroOrmConfig(mikroOrmEntities, pathToMigrations)
+      const OrmConfig = getMikroOrmConfig(
+        this.mikroOrmEntities,
+        this.pathToMigrations,
+        this.schema
+      )
 
       // Initializing the ORM
       this.orm = await MikroORM.init(OrmConfig)
 
-      if (this.orm === null) {
-        throw new Error("ORM not configured")
+      this.manager = this.orm.em
+
+      try {
+        await this.orm.getSchemaGenerator().ensureDatabase()
+      } catch (err) {}
+
+      await this.manager?.execute(
+        `CREATE SCHEMA IF NOT EXISTS "${this.schema ?? "public"}";`
+      )
+
+      const pendingMigrations = await this.orm
+        .getMigrator()
+        .getPendingMigrations()
+
+      if (pendingMigrations && pendingMigrations.length > 0) {
+        await this.orm
+          .getMigrator()
+          .up({ migrations: pendingMigrations.map((m) => m.name!) })
+      } else {
+        await this.orm.schema.refreshDatabase() // ensure db exists and is fresh
       }
-
-      this.manager = await this.orm.em
-
-      await this.orm.schema.refreshDatabase() // ensure db exists and is fresh
     },
 
     async clearDatabase() {
@@ -102,7 +120,17 @@ export function getMikroOrmWrapper(
         throw new Error("ORM not configured")
       }
 
-      await this.orm.close()
+      await this.manager?.execute(
+        `DROP SCHEMA IF EXISTS "${this.schema ?? "public"}" CASCADE;`
+      )
+
+      await this.manager?.execute(
+        `CREATE SCHEMA IF NOT EXISTS "${this.schema ?? "public"}";`
+      )
+
+      try {
+        await this.orm.close()
+      } catch {}
 
       this.orm = null
       this.manager = null