Extract EE specific sidekiq-cluster for bin

Move sidekiq-cluster binary to the ee folder

• The binary should be moved to the ee/bin folder
• Docs should be updated to reference the new location https://gitlab.com/gitlab-org/gitlab-ee/blob/master/doc/administration/operations/extra_sidekiq_processes.md
• Omnibus should be updated to point at the new location https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/files/gitlab-cookbooks/gitlab-ee/templates/default/sv-sidekiq-cluster-run.erb

Original description

We have the following files containing EE specific code. We should move them to ee/

• bin/elastic_repo_indexer
• bin/sidekiq-cluster
• bin/geo_log_cursor