Bugfix/keycloak userfed idempotency (#5732)
* fix(modules/keycloak_user_federation): fixes ...
... federation read call not finding already existing federations
properly because of bad parametrisation
* fix(modules/keycloak_user_federation): added ...
... new integration test for module idempotency bugfix
* added changelog fragment for pr
Co-authored-by: Mirko Wilhelmi <Mirko.Wilhelmi@sma.de>
(cherry picked from commit 0ca41dedce)
Co-authored-by: morco <thegreatwiper@web.de>
