feat: add SAML as identity provider (#6454)

* feat: first implementation for saml sp

* fix: add command side instance and org for saml provider

* fix: add query side instance and org for saml provider

* fix: request handling in event and retrieval of finished intent

* fix: add review changes and integration tests

* fix: add integration tests for saml idp

* fix: correct unit tests with review changes

* fix: add saml session unit test

* fix: add saml session unit test

* fix: add saml session unit test

* fix: changes from review

* fix: changes from review

* fix: proto build error

* fix: proto build error

* fix: proto build error

* fix: proto require metadata oneof

* fix: login with saml provider

* fix: integration test for saml assertion

* lint client.go

* fix json tag

* fix: linting

* fix import

* fix: linting

* fix saml idp query

* fix: linting

* lint: try all issues

* revert linting config

* fix: add regenerate endpoints

* fix: translations

* fix mk.yaml

* ignore acs path for user agent cookie

* fix: add AuthFromProvider test for saml

* fix: integration test for saml retrieve information

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

internal/static/i18n/ja.yaml

@@ -476,6 +476,8 @@ Errors:
       NoChallenge: WebAuthN チャレンジを使用しないセッション
   Intent:
     IDPMissing: リクエストにIDP IDが含まれていません
+    IDPInvalid: リクエストのIDPが無効
+    ResponseInvalid: IDPの回答は無効
     SuccessURLMissing: リクエストに成功時の URL がありません
     FailureURLMissing: リクエストに失敗の URL がありません
     StateMissing: リクエストに State パラメータがありません