Use 202 for token polling endpoint instead of 204 (#1103)

internal/proto/local/controller/api/resources/authmethods/v1/auth_method.proto

@@ -165,4 +165,12 @@ message OidcAuthMethodAuthenticateCallbackResponse {
 message OidcAuthMethodAuthenticateTokenRequest {
 	// The ID of the pending token
 	string token_id = 10 [json_name="token_id"];
+}
+
+// Internal only: the structure of a token response if it _does not_ contain a
+// token.
+message OidcAuthMethodAuthenticateTokenResponse {
+	// The status. This will always be "unknown". It will never be forwarded to
+	// the consumer.
+	string status = 10;
 }