WIP: Sidekiq worker versioning

The best explanation of the feature and how it works can be found in the newly added documentation:

https://gitlab.com/gitlab-org/gitlab-ce/blob/dm-sidekiq-versioning/doc/development/sidekiq_style_guide.md#versioning

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/37292

EE port: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3576