Update queue:run to run garbage collection

[marcaddeo]

This updates the queue:run command to run garbage collection against the
queue if it supports it. If we don't do this, queue items expirations
never actually expire until the next cron run.

[weitzman]

Why is waiting for the next cron a bad idea? I'm not sure queue running implies garbage collection (i.e. it could be a separate command).

[marcaddeo]

@weitzman I'm using a DelayedRequeueException to have my queue item reprocessed in 5 minutes, but we only run cron every 10 minutes.

And then I'm running queue:run <queue name> every minute to ensure my queued items are quickly processed.

I realize I could just run cron more frequently, or instead of queue:run, but this just seemed like strange behavior to me when running queue:run quickly and not having my delayed requeued items process.

Core does queue garbage collection in system_cron before any queue workers are run, so it seemed slightly implied that it would be run for a queue runner to me.

I could see it being a separate queue command as well if you think that's the better route.

[weitzman]

Thoughts? @juampynr @davereid @damiankloip and any other queue folks?

[weitzman]

This looks useful and benign so in it goes. Sorry for the big delay.

[juampynr]

Sorry, super late review but still: this looks great!