New Slack application service breaks chatops
For GitLab.com we seem to have a new Slack application service that replaces Slash commands. Instead of supporting both in parallel for some reason the decision was made to immediately disable Slash commands on GitLab.com, forcing users to use the new setup.
This breaks chatops because we extend SlackSlashCommandService in https://gitlab.com/gitlab-org/gitlab-ee/blob/master/ee/app/models/ee/slack_slash_commands_service.rb so chatops knows how to send responses back. For this new Slack service we probably use a different class that doesn't have this code, thus breaking chatops.