getAggregateQuery() entity query access check false report

[mstenta]

Probably a follow-up to the improvements that were made in #454...

The following code is resulting in PHPStan error: "Missing explicit access check on entity query."

$query = $this->entityTypeManager->getStorage($entity_type)->getAggregateQuery()
  ->accessCheck(TRUE)
  ->condition('type', $bundle);

Perhaps we just need to accommodate getAggregateQuery()? Or is there a "correct" way to structure the code to make PHPStan happy? :-)

[Boegie]

Added a PR to try and fix getAggregateQuery() problems.