chore(): Add retry strategy to database connection (#12713)

RESOLVES FRMW-2978

**What**
Add retry mechanism to database connection management to prevent failing when the server start faster than what makes the connection available

packages/medusa/src/loaders/index.ts

@@ -129,7 +129,7 @@ export async function initializeContainer(
     [ContainerRegistrationKeys.REMOTE_QUERY]: asValue(null),
   })
 
-  pgConnectionLoader()
+  await pgConnectionLoader()
   return container
 }