Create a way to empty a queue

There was once a command for drupal console: #2920030: Add a Drupal Console command for clearing a queue →

I suggest “advancedqueue:queue:clear [queue_name]”

Added a simple command

I think these kind of commands should have a confirm/are you sure step, running this by mistake and clearing the queue by mistake is rough. And those things happen.

@johnwebdev is right there should be a confirmation message before deleting it. I have applied the patch #6 and its now deleting the queue.

I created MR where a confirmation message before deleting added

This assumes incorrectly that the queue uses a database backend.

We shouldn’t assume that, and instead add a clear method to the backend interface and then call it.