Changes to List group members

removed the optional property items/items/user/allOf[subschema #1: User]/credentials/items/anyOf[subschema #1: User Credential Federation]/allOf[subschema #2]/provider/allOf[subschema #1: Provider]/protocols/openid/external_id_claim from the response with the 200 status

added the required property items/items/user/allOf[subschema #1: User]/external to the response with the 200 status

added the required property items/items/user/allOf[subschema #1: User]/groups/items/external to the response with the 200 status

added the required property items/items/user/allOf[subschema #1: User]/groups/items/external_issuer to the response with the 200 status

endpoint added