We should include `maniphestTaskPHIDs` into `differential.query` results.
Can we add something like this to `DifferentialQueryConduitAPIMethod` class?
```
$maniphest = 'PhabricatorManiphestApplication';
$maniphest_installed = PhabricatorApplication::isClassInstalled($maniphest);
// <...>
if ($maniphest_installed) {
$taskPHIDs = PhabricatorEdgeQuery::loadDestinationPHIDs(
$revision->getPHID(),
DifferentialRevisionHasTaskEdgeType::EDGECONST);
$tasks_key = id(new DifferentialManiphestTasksField)->getFieldKeyForConduit();
$result[$tasks_key] = $taskPHIDs;
}
```
Or we need something "smarter"?