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-test-utils/src/medusa-test-runner-utils/use-db.ts

@@ -15,7 +15,7 @@ export async function initDb() {
     "@medusajs/framework"
   )
 
-  const pgConnection = pgConnectionLoader()
+  const pgConnection = await pgConnectionLoader()
   await featureFlagsLoader()
 
   return pgConnection