[1.x] [extensibility] feat: allow classes that extends AbstractJob to be placed on a specified queue (#4026)

* feat: allow classes that extends AbstractJob to be placed on a specific queue

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* php 7.3 compat

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* change  to  to avoid conflicts with extensions that already do this

* chore: add docblock explaining that this solution only works for Redis queues

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* chore: update docblock

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---------

Co-authored-by: StyleCI Bot <bot@styleci.io>

Author: imorland

src/SendPusherNotificationsJob.php

@@ -28,6 +28,8 @@ class SendPusherNotificationsJob extends AbstractJob
 
     public function __construct(BlueprintInterface $blueprint, array $recipients)
     {
+        parent::__construct();
+
         $this->blueprint = $blueprint;
         $this->recipients = $recipients;
     }