chore: Cleanup utils package (#9238)

Fixes: FRMW-2712

Old PR: https://github.com/medusajs/medusa/pull/9234 Closed because of incorrect branch naming

Co-authored-by: Adrien de Peretti <25098370+adrien2p@users.noreply.github.com>

packages/core/utils/jest.config.js

@@ -1,13 +1,24 @@
 module.exports = {
   transform: {
-    "^.+\\.[jt]s?$": [
-      "ts-jest",
+    "^.+\\.[jt]s$": [
+      "@swc/jest",
       {
-        tsconfig: "tsconfig.spec.json",
-        isolatedModules: true,
+        jsc: {
+          parser: {
+            syntax: "typescript",
+            decorators: true,
+          },
+          transform: {
+            useDefineForClassFields: false,
+            legacyDecorator: true,
+            decoratorMetadata: true,
+          },
+          target: "ES2021",
+        },
       },
     ],
   },
+  testPathIgnorePatterns: [`dist/`, `node_modules/`],
   testEnvironment: `node`,
   moduleFileExtensions: [`js`, `ts`],
 }