flatten and remove nested filter message

buf/registry/plugin/v1beta1/plugin_service.proto

@@ -74,18 +74,6 @@ message ListPluginsRequest {
  // Order by create_time oldest to newest.
  ORDER_CREATE_TIME_ASC = 2;
  }
- // Filter for the list request, if any. When multiple filters are specified, they are combined.
- message Filter {
- // The specific Organizations to list Plugins for.
- //
- // If empty, all Plugins for all Organizations are listed, but this functionality is limited to
- // Users with the necessary permissions.
- repeated buf.registry.owner.v1.OwnerRef owner_refs = 1;
- // The collections to list Plugins for.
- //
- // If empty, all Plugins are listed regardless of collection.
- repeated string collection_names = 2;
- }
  // The maximum number of items to return.
  //
  // The default value is 10.
@@ -94,13 +82,19 @@ message ListPluginsRequest {
  //
  // If empty, the first page is returned.
  string page_token = 2 [(buf.validate.field).string.max_len = 4096];
- // An optional filter to filter the list of Plugins. If unset, all Plugins for all organizations
- // are listed, but this functionality is limited to Users with the necessary permissions.
- Filter filter = 3;
+ // The specific Organizations to list Plugins for.
+ //
+ // If empty, all Plugins for all Organizations are listed, but this functionality is limited to
+ // Users with the necessary permissions.
+ repeated buf.registry.owner.v1.OwnerRef owner_refs = 3;
+ // The collections to list Plugins for.
+ //
+ // If empty, all Plugins are listed regardless of collection.
+ repeated string collection_names = 4;
  // The order to return the Plugins.
  //
  // If not specified, defaults to ORDER_CREATE_TIME_DESC.
- Order order = 4 [(buf.validate.field).enum.defined_only = true];
+ Order order = 5 [(buf.validate.field).enum.defined_only = true];
 }
 
 message ListPluginsResponse {