fix(utils,product): mikro orm connection loader (#4825)

Fix shared connection property check

integration-tests/plugins/__tests__/modules/load-standalone.ts

@@ -0,0 +1,29 @@
+import dbFactory from "./../../../environment-helpers/use-template-db"
+
+jest.setTimeout(30000)
+
+describe("Standalone Modules", () => {
+  beforeAll(async () => {
+    const DB_HOST = process.env.DB_HOST
+    const DB_USERNAME = process.env.DB_USERNAME
+    const DB_PASSWORD = process.env.DB_PASSWORD
+    const DB_NAME = process.env.DB_TEMP_NAME
+
+    process.env.POSTGRES_URL = `postgres://${DB_USERNAME}:${DB_PASSWORD}@${DB_HOST}/${DB_NAME}`
+    await dbFactory.createFromTemplate(DB_NAME)
+  })
+
+  afterAll(async () => {
+    process.env.POSTGRES_URL = undefined
+  })
+
+  it("Should migrate database and initialize Product module using connection string from environment variable ", async function () {
+    const { initialize, runMigrations } = require("@medusajs/product")
+    await runMigrations()
+
+    const product = await initialize()
+    const productList = await product.list()
+
+    expect(productList).toEqual(expect.arrayContaining([]))
+  })
+})