This is the endpoint that is called when the user wants to initiate a SSO SAML login from Baserow (the service provider). The user will be redirected to the SAML identity provider (IdP) where the user can authenticate. Once logged in in the IdP, the user will be redirected back to the assertion consumer service endpoint (ACS) where the SAML response will be validated and a new JWT session token will be provided to work with Baserow APIs.