[5.8] Remove prefix setting for Amazon SQS, add url

[alexkb]

When using Amazon SQS as the queue backend, it's not convenient to have the queue name automatically appended to the Amazon SQS endpoint URL. This is because the Amazon SQS URL may need to be different depending on environment, whilst the queue name should remain the same, given code Job::dispatch()->onQueue('emails') and queue:work --queue=emails commands will specify it.

This PR removes the use of the SQS specific setting prefix and relies on a new SQS specific setting url. This means it can change independently of the queue name.

This is a obviously, a breaking change so it would have to be in a major version release if it was accepted.

A PR over on the laravel/laravel repository to update config/queue.php has also been submitted.

[taylorotwell]

Just make the full URL your queue name this in this case and remove the prefix option entirely from your configuration.

[alexkb]

Thanks for taking a look at this @taylorotwell, but if you "make the full URL your queue name", that same queue name has to be mentioned in your enqueue calls and queue:work command if you utilise queue names, does it not?

[alexkb]

Ok, so I checked with @taylorotwell: if you use his proposed solution of setting the prefix to empty and putting the full queue url in the queue name setting, you can get away with things by having duplicate queue connections for each queue and then just relying on the connection name. So in your caller code you would do this: Queue::connection('foo')->push() and in the queue:work command you can simply pass the connection name as an argument.

Thanks @taylorotwell!