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/bg.yaml

@@ -505,6 +505,8 @@ Errors:
       NoChallenge: Сесия без WebAuthN предизвикателство
   Intent:
     IDPMissing: IDP липсва в заявката
+    IDPInvalid: IDP невалиден за заявката
+    ResponseInvalid: Отговорът на IDP е невалиден
     SuccessURLMissing: В заявката липсва URL адрес за успех
     FailureURLMissing: В заявката липсва URL адрес за грешка
     StateMissing: В заявката липсва параметър състояние