chore: remove internal module resources option (#9582)

What:
* removes resouces type "shared" or "isolated" from internal modules.
* modules can have an isolated database connection by providing a database config as part of their options on `medusa-config`

CLOSES: FRMW-2593

integration-tests/api/medusa-config.js

@@ -42,7 +42,6 @@ module.exports = {
     [Modules.AUTH]: true,
     [Modules.USER]: {
       scope: "internal",
-      resources: "shared",
       resolve: "@medusajs/user",
       options: {
         jwt_secret: "test",