chore(medusa): Loader shutdown fixes (#7443)

**What**
prepare shutdown was called after modules shutdown

packages/medusa/src/loaders/index.ts

@@ -53,8 +53,10 @@ async function subscribersLoader(
           ignore: ["**/*.d.ts", "**/*.map"],
         }
       )
-      return Promise.all(
-        files.map(async (file) => new SubscriberLoader(file, container).load())
+      return await Promise.all(
+        files.map(
+          async (file) => await new SubscriberLoader(file, container).load()
+        )
       )
     })
   )
@@ -124,7 +126,6 @@ export default async ({
   container: MedusaContainer
   app: Express
   shutdown: () => Promise<void>
-  prepareShutdown: () => Promise<void>
 }> => {
   const container = await initializeContainer(rootDirectory)
   const configModule = container.resolve(
@@ -134,13 +135,12 @@ export default async ({
   const plugins = getResolvedPlugins(rootDirectory, configModule, true) || []
   await registerWorkflows(plugins)
 
-  const {
-    onApplicationShutdown: medusaAppOnApplicationShutdown,
-    onApplicationPrepareShutdown: medusaAppOnApplicationPrepareShutdown,
-  } = await loadMedusaApp({
-    container,
-    linkModules: await resolvePluginsLinks(plugins, container),
-  })
+  const pluginLinks = await resolvePluginsLinks(plugins, container)
+  const { onApplicationShutdown, onApplicationPrepareShutdown } =
+    await loadMedusaApp({
+      container,
+      linkModules: pluginLinks,
+    })
 
   const entrypointsShutdown = await loadEntrypoints(
     plugins,
@@ -154,13 +154,14 @@ export default async ({
     const pgConnection = container.resolve(
       ContainerRegistrationKeys.PG_CONNECTION
     )
-    await medusaAppOnApplicationShutdown()
+
+    await onApplicationPrepareShutdown()
+    await onApplicationShutdown()
 
     await promiseAll([
       container.dispose(),
       pgConnection?.context?.destroy(),
       entrypointsShutdown(),
-      medusaAppOnApplicationShutdown(),
     ])
   }
 
@@ -168,6 +169,5 @@ export default async ({
     container,
     app: expressApp,
     shutdown,
-    prepareShutdown: medusaAppOnApplicationPrepareShutdown,
   }
 }