This commits introduces the `sidekiq_report_long_running_jobs_minutes`
global setting which allows a site administrator to log a warning in the
Rails log when a Sidekiq job has been running for too long.
The warning is logged with the backtrace of the thread that is
processing the Sidekiq job to make it easier to figure out what a
sidekiq job is stuck on.
Alan Guo Xiang Tan