fix(user): Updating user info when authenticating with external IDP (#11046)

# Which Problems Are Solved

User profile updates were not propagated when using External OIDC IDP +
Login V2

# How the Problems Are Solved

* `UpdateHumanUserRequest` is added to
`RetrieveIdentityProviderIntentResponse`
* `UpdateHumanUserRequest` is returned in the
`RetrieveIdentityProviderIntentResponse` when the user already exists
during external IDP auth, which is then used in the frontend to update
the user info

# Additional Changes

* Moved integration tests related to user intent to a separate test file
* Fix redirection after external IDP user registration

# Additional Context
- Closes #10838 
- Follow up: https://github.com/zitadel/zitadel/issues/11053

---------

Co-authored-by: Max Peintner <[email protected]>

apps/login/src/lib/server/idp-intent.test.ts

@@ -76,6 +76,17 @@ describe("processIDPCallback", () => {
         email: "[email protected]",
       },
     },
+    updateHumanUser: {
+      username: "testuser",
+      profile: {
+        givenName: "Test",
+        familyName: "User 1",
+        displayName: "Test User 1",
+      },
+      email: {
+        email: "[email protected]",
+      },
+    },
   };
 
   const defaultIdp = {
@@ -257,8 +268,8 @@ describe("processIDPCallback", () => {
         serviceUrl: "https://api.example.com",
         request: expect.objectContaining({
           userId: "user123",
-          profile: defaultIntent.addHumanUser.profile,
-          email: defaultIntent.addHumanUser.email,
+          profile: defaultIntent.updateHumanUser.profile,
+          email: defaultIntent.updateHumanUser.email,
         }),
       });
     });

apps/login/src/lib/server/idp-intent.ts

@@ -119,7 +119,7 @@ export async function processIDPCallback({
 
     console.log("[IDP Process] Intent retrieved successfully, processing business logic");
 
-    const { idpInformation, userId, addHumanUser } = intent;
+    const { idpInformation, userId, addHumanUser, updateHumanUser } = intent;
 
     if (!idpInformation) {
       console.error("[IDP Process] IDP information missing");
@@ -161,15 +161,15 @@ export async function processIDPCallback({
     // ============================================
     if (userId && !link) {
       // Auto-update user if enabled
-      if (options?.isAutoUpdate && addHumanUser) {
+      if (options?.isAutoUpdate && updateHumanUser) {
         try {
           await updateHuman({
             serviceUrl,
             request: create(UpdateHumanUserRequestSchema, {
               userId: userId,
-              profile: addHumanUser.profile,
-              email: addHumanUser.email,
-              phone: addHumanUser.phone,
+              profile: updateHumanUser.profile,
+              email: updateHumanUser.email,
+              phone: updateHumanUser.phone,
             }),
           });
           console.log("[IDP Process] User auto-updated successfully");