Move all uses of Onboarding::ProgressService to ee

See https://docs.gitlab.com/ee/development/ee_features.html for help here on how to accomplish this.

• Remove the placement of this action in post receive as it is being put in the right place in !149617 (merged) to address a 'apply template' not recording this issue. Originally on #456533 (closed).

Plan

• Move Onboarding worker to ee and calls to it. - !165834 (merged)
• Move direct calls to service to ee - !165674 (merged)
• Move calls to service through workers to ee - !165699 (merged)