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/modules/auth/integration-tests/__fixtures__/auth-identity/index.ts

@@ -0,0 +1,37 @@
+import { AuthIdentity } from "@models"
+import { SqlEntityManager } from "@mikro-orm/postgresql"
+
+export async function createAuthIdentities(
+  manager: SqlEntityManager,
+  userData: any[] = [
+    {
+      id: "test-id",
+      entity_id: "test-id",
+      provider: "manual",
+      scope: "store",
+    },
+    {
+      id: "test-id-1",
+      entity_id: "test-id-1",
+      provider: "manual",
+      scope: "store",
+    },
+    {
+      entity_id: "test-id-2",
+      provider: "store",
+      scope: "store",
+    },
+  ]
+): Promise<AuthIdentity[]> {
+  const authIdentities: AuthIdentity[] = []
+
+  for (const user of userData) {
+    const authIdentity = manager.create(AuthIdentity, user)
+
+    authIdentities.push(authIdentity)
+  }
+
+  await manager.persistAndFlush(authIdentities)
+
+  return authIdentities
+}