Think on a way to avoid triggering tasks that are disabled

[acelaya]

Currently, Shlink has a number of background jobs and tasks that can be run with RoadRunner or openswoole.

These tasks can be enabled or disabled, but all of them are always triggered no matter what, and each one of them is responsible to immediately exit if not enabled.

This was a reasonable approach at first, but as the number of tasks grows, this is starting to become problematic, because there's a limited amount of job workers, and too many tasks can potentially block each other.

It would be good to find a way to not trigger tasks at all if they are not enabled.