feat: add ldap external idp to login api (#5938)

* fix: handling of ldap login through separate endpoint

* fix: handling of ldap login through separate endpoint

* fix: handling of ldap login through separate endpoint

* fix: successful intent for ldap

* fix: successful intent for ldap

* fix: successful intent for ldap

* fix: add changes from code review

* fix: remove set intent credentials and handle ldap errors

* fix: remove set intent credentials and handle ldap errors

* refactor into separate methods and fix merge

* remove mocks

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Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/static/i18n/zh.yaml

@@ -137,6 +137,7 @@ Errors:
       MinimumExternalIDPNeeded: 必须添加至少一个 IDP
       AlreadyExists: 外部 IDP 已存在
       NotFound: 未找到外部 IDP
+      LoginFailed: 外部 IDP 登录失败
     MFA:
       OTP:
         AlreadyReady: OTP (一次性密码) 已经设置好了