SAML Users should be able to be deleted using the UI

Currently we cannot delete SAML users, the button appears inactive on the User administration panel, normally external users are not deleted, but with saml users being in its own table there is a need to delete them.

AC

• The button on the UI of user administration for deleting is active
• Saml Users are correctly deleted after hitting the button (user and rolemappings related to that user should be gone)