feat: v2alpha user service idp endpoints (#5879)

* feat: v2alpha user service idp endpoints

* feat: v2alpha user service intent endpoints

* begin idp intents (callback)

* some cleanup

* runnable idp authentication

* cleanup

* proto cleanup

* retrieve idp info

* improve success and failure handling

* some unit tests

* grpc unit tests

* add permission check AddUserIDPLink

* feat: v2alpha intent writemodel refactoring

* feat: v2alpha intent writemodel refactoring

* feat: v2alpha intent writemodel refactoring

* provider from write model

* fix idp type model and add integration tests

* proto cleanup

* fix integration test

* add missing import

* add more integration tests

* auth url test

* feat: v2alpha intent writemodel refactoring

* remove unused functions

* check token on RetrieveIdentityProviderInformation

* feat: v2alpha intent writemodel refactoring

* fix TestServer_RetrieveIdentityProviderInformation

* fix test

* i18n and linting

* feat: v2alpha intent review changes

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>
Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>

internal/static/i18n/en.yaml

@@ -476,6 +476,15 @@ Errors:
     Terminated: Session already terminated
     Token:
       Invalid: Session Token is invalid
+  Intent:
+    IDPMissing: IDP ID is missing in the request
+    SuccessURLMissing: Success URL is missing in the request
+    FailureURLMissing: Failure URL is missing in the request
+    StateMissing: State parameter is missing in the request
+    NotStarted: Intent is not started or was already terminated
+    NotSucceeded: Intent has not succeeded
+    TokenCreationFailed: Token creation failed
+    InvalidToken: Intent Token is invalid
 
 AggregateTypes:
   action: Action