Schedule mirror updates in parallel

Closes #5034

See merge request gitlab-org/gitlab-ee!4720

Resolve "Merge requests and issues don't show for all subgroups"

Closes #43510

See merge request gitlab-org/gitlab-ce!17312

CE upstream - 2018-02-27 08:08 UTC

Closes gitlab-ce#43579

See merge request gitlab-org/gitlab-ee!4742

Previously, these wouldn't count issues or MRs in subgroups - meaning that if
_this_ group had no issues or MRs, we'd show the empty state, which was wrong.

EE: Expose ChatName objects to slash commands

See merge request gitlab-org/gitlab-ee!4693

Expose ChatName objects to slash commands

See merge request gitlab-org/gitlab-ce!17295

Remove commit_pipelines webpack entry point

See merge request gitlab-org/gitlab-ce!17379

Remove commit_pipelines webpack entry point (EE)

See merge request gitlab-org/gitlab-ee!4737

Resolve "Verified commits not displaying properly"

Closes #43315

See merge request gitlab-org/gitlab-ce!17323

Resolve "Improve Variables validation message"

Closes #43275

See merge request gitlab-org/gitlab-ce!17135

Disable RBAC on Prometheus values.yml

Closes #43621

See merge request gitlab-org/gitlab-ce!17372

# Conflicts:
#   config/webpack.config.js

Signed-off-by: Rémy Coutable <remy@rymai.me>

Remove environments folder webpack entry point

See merge request gitlab-org/gitlab-ce!17380

Remove environments folder webpack entry point (EE)

See merge request gitlab-org/gitlab-ee!4738

Rename "Approve Additionally" to "Add approval"

See merge request gitlab-org/gitlab-ee!4717

# Conflicts:
#	app/assets/javascripts/boards/components/board_new_issue.vue
#	app/assets/javascripts/boards/index.js
#	app/assets/javascripts/boards/stores/boards_store.js
#	app/assets/javascripts/environments/components/environments_table.vue
#	app/assets/javascripts/ide/components/repo_file.vue
#	app/assets/javascripts/ide/components/repo_tab.vue
#	app/assets/javascripts/vue_merge_request_widget/components/mr_widget_pipeline.vue
#	config/webpack.config.js
#	spec/javascripts/environments/environment_table_spec.js
#	spec/javascripts/repo/components/repo_commit_section_spec.js
#	spec/javascripts/vue_mr_widget/components/mr_widget_pipeline_spec.js

[ci skip]

CE upstream - 2018-02-26 16:08 UTC

Closes #3639 and gitaly#1036

See merge request gitlab-org/gitlab-ee!4725

CONTRIBUTING.md: Use a proper example for the stewardship label

Closes #43579

See merge request gitlab-org/gitlab-ce!17347

Adjust the API issues move spec to use project ID 0

Closes #43631

See merge request gitlab-org/gitlab-ce!17381

Closes #43631

Closes #43631

Geo - Fix repository synchronization order for projects updated recently

Closes #5054

See merge request gitlab-org/gitlab-ee!4727

Resolve "Error 500 on route "/admin/application_settings/services/1882/edit" -> edit Prometheus Service Template"

Closes #43532

See merge request gitlab-org/gitlab-ce!17377

Resolve "Error 500 on route "/admin/application_settings/services/1882/edit" -> edit Prometheus Service Template"