fix: use idToken for mapping when using old configs (#5458)

* fix: use idToken for mapping when using old configs

* fix events and add tests

internal/idp/providers/oidc/session.go

@@ -47,6 +47,9 @@ func (s *Session) FetchUser(ctx context.Context) (user idp.User, err error) {
 	if err != nil {
 		return nil, err
 	}
+	if s.Provider.useIDToken {
+		info = s.Tokens.IDTokenClaims
+	}
 	u := s.Provider.userInfoMapper(info)
 	return u, nil
 }