Merge branch 'release/undev_v2.0.0' into develop

* release/undev_v2.0.0: (731 commits)
  fixes from staging
  Fix admin checkbox for team member
  update forms
  Update teams members forms
  remove unused action
  Context refactoring step 1
  receive_delayed_notifications in users contexts
  Context refactoring step 1
  Use navless layout for snippets page
  Fix Issue.open_for
  Search on public projects fixes refs #26271
  Fix search context
  Remove unused, but slow code
  Move add projects to team form from bottom to top
  remove Teams from stat on Admin Dashboard
  Fix FilterContext
  Fixed tests. Fixed overrided scope. Better usability for milestone view
  FIx userteams tests
  Fix MR feature
  Check for existing MR only for opened/reopened MR
  ...
Merge branch 'master' into develop

* master:
  fix bugs
Merge branch 'master' into develop

* master:
  Return git-protocol-edition
fix bugs from deploy
remove unactial file
Merge branch 'feature/add_missing_emails' into develop

* feature/add_missing_emails:
  remove unactial file
  fix bugs from deploy
Merge branch 'hotfix/repair_assign_team_to_projects' into develop

* hotfix/repair_assign_team_to_projects:
  Fix namespace errors
  remove mailer base css
Merge branch 'master' into develop

* master:
  Fix label on git protocol
  move .secret file to shared directory
  remove old code
  Update sidekiq
  remove key converting
  block user with remove from team and project
  fix assign team to projects
  fix restart script
  fix bugs from deploy
  fix prioritet on event builder
  save
  save
  Update deleted_user_team_user_relationship_user_team_user_relationship_email (replace neber with member)

Conflicts:
	app/mailers/event_notification_mailer.rb
Merge branch 'master' into develop

* master:
  Fix bugs with miltithread event management
  Update hierarchi builder for events
  Update notification processing
  fix bug
  send notification for member subscription
  fix emails dublications
Update default setting for new projects
Enable redmine as default issue tracker
Issues enabled by default on staging server
Disable issues tab by default
Fix project list on group page fixes refs #30024, #30027
fix 500 if team not exist refs fixes #26399
Ignoring updates user by system
No notification if commit author subscribed on project changes
Deploy keys selected from all known projects, not only master refs #29844
Update block context
more events on user page