Ensure any args are passed onto sidekiq

What does this MR do?

In gitlab-development-kit!2077 (merged) we explicitly set the --timeout for the rails-background-jobs GDK service to be half (10 secs) of the number of secs we wait from the runit side of things (20 secs). The idea here was to try to improve the reliability of the rails-background-jobs service which can at times enter a 'zombie' state and need to be forcibly killed, presumably because the default --timeout for sidekiq is 25 secs.

This MR ensures that any args passed to sidekiq (in this case, from GDK) are accepted when the time comes to actually execute. Without this change, In gitlab-development-kit!2077 (merged) has no impact.

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