Enables frozen string in the following:

* ee/app/policies/**/*.rb
* ee/app/presenters/**/*.rb
* ee/app/serializers/**/*.rb
* ee/app/services/**/*.rb
* ee/app/uploaders/**/*.rb
* ee/app/validators/**/*.rb
* ee/app/workers/**/*.rb

Partially addresses gitlab-org/gitlab-ce/#47424.

Geo: Constantly reverify repositories

Closes #7347

See merge request gitlab-org/gitlab-ee!8550

Changes initial state for disabled prometheus integrations

Closes #8590 and gitlab-ce#49267

See merge request gitlab-org/gitlab-ee!8434

To constantly re-verify repositories we should find projects
whe the last verification attempt happened before the minimum
re-verification interval. This interval says after how many
days (at least) a repository should be re-rverified.

This commit add a minimum_reverification_interval column to
the geo_nodes table. This columns says after how many days
(at least) a repository should reverified.

Add support for Group-level project templates

Closes #6861

See merge request gitlab-org/gitlab-ee!6878

Add API endpoint for vulnerability history at group level

See merge request gitlab-org/gitlab-ee!8603

CE upstream - 2018-12-04 18:45 UTC

Closes gitlab-ce#53600

See merge request gitlab-org/gitlab-ee!8705

Fix gitlab:geo:check rake task

See merge request gitlab-org/gitlab-ee!8714

Merge branch '8444-update-error-message-displayed-when-adding-an-unsupported-project-to-ops-dashboard' into 'master'

Resolve "Update error message displayed when adding an unsupported project to Ops Dashboard"

Closes #8444

See merge request gitlab-org/gitlab-ee!8672

Group SAML metadata endpoint

Closes #6090

See merge request gitlab-org/gitlab-ee!5782

EE: Use group clusters when deploying (DeploymentPlatform)

See merge request gitlab-org/gitlab-ee!8218

Provide vulnerability counts per day per severity for the last 90 days.

Merge branch 'ee-50626-searching-users-by-the-admin-panel-wipes-query-when-using-sort' into 'master'

Fix losing search query when sort users on admin users page

See merge request gitlab-org/gitlab-ee!8640

Remove code related to automatic merging

See merge request gitlab-org/gitlab-ee!8709

Port of Rename project's pipelines relation

See merge request gitlab-org/gitlab-ee!8619

Also adds tests for that feature flag, pushing it over
the danger-review limit requiring longer commit message.

Merge branch '8591-geo-http-403-when-dismissing-free-trial-of-gitlab-com-gold-message' into 'master'

Don't show 'Free Trial of GitLab.com Gold' message for secondary nodes

Closes #8591

See merge request gitlab-org/gitlab-ee!8635

We're moving the automatic merging logic to a separate repository, so
there's no need in keeping this file around.

[ci skip]

[ci skip]

Run Geo check during gitlab check task, plus refactors

See merge request gitlab-org/gitlab-ee!8616

Remove redundant indices on GitLab.com

Closes gitlab-ce#53993 and gitlab-ce#53989

See merge request gitlab-org/gitlab-ee!8695

add 11.6-ce-to-ee docs

See merge request gitlab-org/gitlab-ee!8680

Port to EE: Merge request pipelines

See merge request gitlab-org/gitlab-ee!8601

Extract code into IssueBoardEntity / serializer (follow up)

See merge request gitlab-org/gitlab-ee!8679