feat: add ListOperations partial success flag (#8645)

* feat: add ListOperations partial success flag

feat: add ListOperations unreachable resources
PiperOrigin-RevId: 815887751

Source-Link: googleapis/googleapis@1b14149

Source-Link: googleapis/googleapis-gen@a82519e
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LongRunning/metadata/Longrunning/Operations.php

@@ -376,6 +376,17 @@ public function getOperation($name, array $optionalArgs = [])
      *           If no page token is specified (the default), the first page
      *           of values will be returned. Any page token used here must have
      *           been generated by a previous call to the API.
+     *     @type bool $returnPartialSuccess
+     *           When set to `true`, operations that are reachable are returned as normal,
+     *           and those that are unreachable are returned in the
+     *           [ListOperationsResponse.unreachable] field.
+     *
+     *           This can only be `true` when reading across collections e.g. when `parent`
+     *           is set to `"projects/example/locations/-"`.
+     *
+     *           This field is not by default supported and will result in an
+     *           `UNIMPLEMENTED` error if set unless explicitly documented otherwise in
+     *           service or product specific documentation.
      *     @type RetrySettings|array $retrySettings
      *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
      *           associative array of retry settings parameters. See the documentation on
@@ -401,6 +412,12 @@ public function listOperations($name, $filter, array $optionalArgs = [])
             $request->setPageToken($optionalArgs['pageToken']);
         }
 
+        if (isset($optionalArgs['returnPartialSuccess'])) {
+            $request->setReturnPartialSuccess(
+                $optionalArgs['returnPartialSuccess']
+            );
+        }
+
         $requestParams = new RequestParamsHeaderDescriptor(
             $requestParamHeaders
         );