fix: Add schema only flag on Medusa app loader (#14502)

* fix(build): Introduce a schema only flag for more heavy light weight loading

* fix(build): cleanup and tests

* Create shy-snails-raise.md

* fix(build): cleanup

packages/medusa/src/commands/utils/generate-types.ts

@@ -41,7 +41,7 @@ export async function generateTypes({
 
   const { gqlSchema, modules } = await new MedusaAppLoader().load({
     registerInContainer: false,
-    migrationOnly: true,
+    schemaOnly: true,
   })
 
   const typesDirectory = path.join(directory, ".medusa/types")