feat(auth): Revamp authentication setup (#7387)

* chore: Clean up authentication middlewares

* chore: Rename AuthUser to AuthIdentity

* feat: Define link between user, customer, and auth identity

* feat: Use links for auth, update auth context content

* fix: Adjust user create command with new auth setup

* fix: Make auth login more dynamic, review fixes

* fix: Change test assertions for created by

packages/core/utils/src/link/links.ts

@@ -86,4 +86,16 @@ export const LINKS = {
     Modules.FULFILLMENT,
     "fulfillment_id"
   ),
+  UserAuth: composeLinkName(
+    Modules.USER,
+    "user_id",
+    Modules.AUTH,
+    "auth_identity_id"
+  ),
+  CustomerAuth: composeLinkName(
+    Modules.CUSTOMER,
+    "customer_id",
+    Modules.AUTH,
+    "auth_identity_id"
+  ),
 }