Sign in (Impersonate via JWT)
POST {{base-path}}/auth/signin
https://help.tableau.com/current/api/restapi/en-us/REST/restapirefauthentication.htm#sign_in
POST {{base-path}}/auth/signin
https://help.tableau.com/current/api/restapi/en-us/REST/restapirefauthentication.htm#sign_in