Oidc external IDPs group assignment configuration

Hi,

I see only one option for group assignment(assign to specific groups)in oidc external IDPs configuration settings which is different from saml external IDPs settings(assign to missing groups and others) which has samlattributename parameter as well.

Wanted to know the behaviour of group assignment setting in oidc external IDPs as I noticed it was not giving RBAC controll from IDP to okta for user assignments.

#oidc #extrnalidp @andrea @joycemorrell