CE-EE merge prep branch conflicts

Resolve conflicts for merging CE prep branch into the EE counterpart:

• @mdelaossa app/assets/javascripts/boards/models/list.js
• @mdelaossa app/assets/javascripts/boards/stores/boards_store.js
• @ClemMakesApps app/assets/stylesheets/framework/variables.scss
• @smcgivern app/finders/issues_finder.rb
• @mdelaossa app/services/boards/lists/create_service.rb
• @DouweM app/views/admin/appearances/_form.html.haml
• @lbennett app/views/groups/labels/index.html.haml
• @andr3 app/views/projects/pipelines/_with_tabs.html.haml
• @mikegreiling app/views/projects/settings/ci_cd/_autodevops_form.html.haml
• @lbennett app/views/shared/_label_row.html.haml
• @mdelaossa app/views/shared/issuable/_search_bar.html.haml
• @jprovaznik db/schema.rb
• @mayra-cabrera doc/topics/autodevops/index.md
• @DouweM lib/gitlab/favicon.rb
• @DouweM spec/lib/gitlab/favicon_spec.rb
• @balasankarc spec/lib/gitlab/usage_data_spec.rb

Please make this your highest priority. Thank you! ♥