Allow user to disable default job logging

[mperham]

This PR adds a new configuration knob, :skip_default_job_logging, to disable job logging out of the box, see #6199.

The user can choose when and where to disable the logging. I would recommend leaving it enabled for a reasonable developer experience but in environments like a high-volume production setup, logging output can be significant. This allows the user to opt-out of the logging if it becomes an issue.

Sidekiq.configure_server do |config|
  # disable job logging in production
  config[:skip_default_job_logging] = (config[:environment] == "production")

  # disable sidekiq's job logging everywhere
  config[:skip_default_job_logging] = true
end

[mperham]

This does change the JobLogger constructor. Since that's a breaking change to an internal component, it'll need a minor version bump to 7.3.0.