chore(framework): Move and improve workflows loader (#8363)

**What**
Refactoring Workflows loader and move

FIXES FRMW-2627

packages/medusa/src/loaders/helpers/register-workflows.ts

@@ -1,22 +0,0 @@
-import { glob } from "glob"
-import { PluginDetails } from "@medusajs/types"
-
-/**
- * import files from the workflows directory to run the registration of the wofklows
- * @param pluginDetails
- */
-export async function registerWorkflows(
-  plugins: PluginDetails[]
-): Promise<void> {
-  await Promise.all(
-    plugins.map(async (pluginDetails) => {
-      const files = glob.sync(
-        `${pluginDetails.resolve}/workflows/*.{ts,js,mjs,mts}`,
-        {
-          ignore: ["**/*.d.ts", "**/*.map"],
-        }
-      )
-      return Promise.all(files.map(async (file) => import(file)))
-    })
-  )
-}

packages/medusa/src/loaders/index.ts

@@ -13,13 +13,13 @@ import {
   container,
   expressLoader,
   featureFlagsLoader,
-  LinkLoader,
   JobLoader,
+  LinkLoader,
   logger,
   pgConnectionLoader,
   SubscriberLoader,
+  WorkflowLoader,
 } from "@medusajs/framework"
-import { registerWorkflows } from "./helpers/register-workflows"
 import { getResolvedPlugins } from "./helpers/resolve-plugins"
 import loadMedusaApp from "./medusa-app"
 
@@ -45,6 +45,7 @@ async function subscribersLoader(plugins: PluginDetails[]) {
    */
   await new SubscriberLoader(join(__dirname, "../subscribers")).load()
 
+  // TODO: make it the same as the other loaders, taking an array of paths to load from
   /**
    * Load subscribers from all the plugins.
    */
@@ -121,15 +122,11 @@ async function loadEntrypoints(
 export async function initializeContainer(
   rootDirectory: string
 ): Promise<MedusaContainer> {
-  const configModule = configLoader(rootDirectory, "medusa-config.js")
-  const featureFlagRouter = await featureFlagsLoader(
-    join(__dirname, "feature-flags")
-  )
+  configLoader(rootDirectory, "medusa-config.js")
+  await featureFlagsLoader(join(__dirname, "feature-flags"))
 
   container.register({
     [ContainerRegistrationKeys.LOGGER]: asValue(logger),
-    [ContainerRegistrationKeys.FEATURE_FLAG_ROUTER]: asValue(featureFlagRouter),
-    [ContainerRegistrationKeys.CONFIG_MODULE]: asValue(configModule),
     [ContainerRegistrationKeys.REMOTE_QUERY]: asValue(null),
   })
 
@@ -164,7 +161,10 @@ export default async ({
     container,
   })
 
-  await registerWorkflows(plugins)
+  const workflowsSourcePaths = plugins.map((p) => join(p.resolve, "workflows"))
+  const workflowLoader = new WorkflowLoader(workflowsSourcePaths)
+  await workflowLoader.load()
+
   const entrypointsShutdown = await loadEntrypoints(
     plugins,
     container,