Add PolicyCheckable concern for things passing to policy check

Closes #7000

See merge request gitlab-org/gitlab-ee!6641

if all methods are also presented in the user.

EE-Port of gitlab-ce!20501

See merge request gitlab-org/gitlab-ee!6484

CE upstream - 2018-07-26 17:46 UTC

Closes gitlab-qa#303

See merge request gitlab-org/gitlab-ee!6679

raise SecondaryNotConfigured if Geo DB is not found

See merge request gitlab-org/gitlab-ee!6680

Resolve "Environments dropdown is showing on the cluster health page"

Closes #6919

See merge request gitlab-org/gitlab-ee!6528

Resolve ""Approved" is confusing / wrong wording in merge request widget"

Closes #5439

See merge request gitlab-org/gitlab-ee!6635

[master] Missing CSRF in System Hooks

See merge request gitlab/gitlab-ee!647

[master] EE: Don't expose project names in various counters

See merge request gitlab/gitlab-ee!638

# Conflicts:
#	Gemfile.lock
#	app/assets/javascripts/boards/index.js
#	app/assets/javascripts/vue_shared/components/reports/issues_list.vue
#	app/assets/javascripts/vue_shared/components/reports/report_issues.vue
#	app/helpers/environments_helper.rb
#	lib/gitlab/prometheus/queries/query_additional_metrics.rb
#	locale/gitlab.pot

[ci skip]

CE upstream - 2018-07-26 03:21 UTC

Closes gitlab-ui#11

See merge request gitlab-org/gitlab-ee!6674

Add left-padding to diverged-from-upstream label

Closes #7007

See merge request gitlab-org/gitlab-ee!6647

Full list of vulnerabilities

See merge request gitlab-org/gitlab-ce!20855

Full list of vulnerabilities

Closes #5239

See merge request gitlab-org/gitlab-ee!6675

Remove CSS

See merge request gitlab-org/gitlab-ce!20845

Update the image for the 'danger-review' job

See merge request gitlab-org/gitlab-ce!20856

Resolve "Resize handles for Web IDE right sidebar are too thin"

Closes #48055

See merge request gitlab-org/gitlab-ce!20818

Resolve "BS4: Create new Merge request boxes have different styles"

Closes #48636

See merge request gitlab-org/gitlab-ce!20822

DNS Prefetching + Preconnect of assets_host (CDN Domain)

Closes #49107

See merge request gitlab-org/gitlab-ce!20781

Enable deleting files in the Web IDE

See merge request gitlab-org/gitlab-ce!20595

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