Todo done clicking is kind of unusable.

Closes #25465

See merge request !8691

The Done button will change to an Undo button and the line item will be greyed out.
Bold links will be unbolded.
The user can undo the task by clicking the Undo button.

Make pipeline retry take stages order into account

Closes #27431, #23710, and #26551

See merge request !9021

Move dashboard issues spinach test to Rspec

See merge request !8955

* master: (313 commits)
  Allow slashes in slash command arguments
  Add API endpoint to get all milestone merge requests
  remove trailing comma
  Restore pagination to admin abuse reports
  replace deprecated NoErrorsPlugin with NoEmitOnErrorsPlugin
  only compress assets in production
  Reduce number of pipelines created to test pagination
  add CHANGELOG.md entry for !8761
  prevent diff unfolding link from appearing for deleted files
  fix build failures
  only show diff unfolding link if there are more lines to show
  fix typo in node section
  Only yield valid references in ReferenceFilter.references_in
  Cache js selectors; fix css
  move "Install node modules" step before "Migrate DB" within update process
  Renders pagination again for pipelines table
  update migration docs for 8.17 to include minimum node version
  Add CHANGELOG file
  Fix positioning of top scroll button
  Remove comments in migration
  ...

https://gitlab.com/gitlab-org/gitlab-ce/issues/23036

Move 'User Snippets' Spinach feature to Rspec

See merge request !8574

# Conflicts:
#   db/schema.rb