Feature request: Configurable log-level for `handle_failed_job`

Currently all errors in jobs are logged in ERROR log-level.

In our case we would like to reduce cases where an automatic retry might solve the issue without manual intervention to WARNING.

How are the chances that a PR making the level argument here configurable would be accepted?

delayed_job/lib/delayed/worker.rb

Line 305 in ea4879d

job_say job, "FAILED (#{job.attempts} prior attempts) with #{error.class.name}: #{error.message}", 'error'