chore: Start cleaning up medusa-core-utils (#7450)

**What**
- remove medusa-core-utils
- dispatch the utils where they belongs
- update usage

**NOTE**
I have been wondering if the graceful class should go into the utils package or medusa package, I ve put it in the medusa package as it seems to be the best place I can see for now and is tight to the server as well. Also, I wanted to avoid the utils package to depends on http and net dependencies, happy to change that if you feel like it

integration-tests/environment-helpers/use-db.js

@@ -1,6 +1,6 @@
 const path = require("path")
 
-const { getConfigFile } = require("medusa-core-utils")
+const { getConfigFile } = require("@medusajs/utils")
 const { asValue } = require("awilix")
 const {
   isObject,