Fix wrong tier error message for Operations dashboard

See merge request gitlab-org/gitlab-ee!16319

The operations dashboard feature was brought from Ultimate to Premium
in GitLab 11.10
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/10586.

This renames some missing items from Gold to Silver.

Optimize /admin/applications so that it does not timeout

Closes #67228

See merge request gitlab-org/gitlab-ce!32852

[Backend]  API for Step 2 of Trial

See merge request gitlab-org/gitlab-ee!15490

We need to create Leads when customers are requesting a trial for
GL.com. In order to do it we're going to use a service that will call a
custom endpoint on the subscription portal.

Add additional dirs to QA image Dockerignore

See merge request gitlab-org/gitlab-ce!32900

Optimize queries for snippet listings

See merge request gitlab-org/gitlab-ce!32576

Add instructions for defining stages

See merge request gitlab-org/gitlab-ce!32896

Geo: Docker Registry replication documentation (4/4)

Closes gitlab-ee#2870

See merge request gitlab-org/gitlab-ce!31196

Add the Upgrade button to the User Billings page

Closes customers-gitlab-com#518

See merge request gitlab-org/gitlab-ee!15075

Geo: Refactor file replication

See merge request gitlab-org/gitlab-ee!16382

Add view tests for project sidebar - security & compliance

See merge request gitlab-org/gitlab-ee!16357

Fix graphql-explorer CSP violation

See merge request gitlab-org/gitlab-ce!32882

Backporting https://github.com/rmosolgo/graphiql-rails/pull/71

Set max-age and secure flag for pages auth cookies

See merge request gitlab/gitlab-ee!1231

Do not create projects from group template if project is not descendant of that group

See merge request gitlab/gitlab-ee!1262

Set max-age and secure flag for pages auth cookies

See merge request gitlab/gitlabhq!3378

Resolve "Forks count do not match after searching"

Closes #66023

See merge request gitlab-org/gitlab-ce!31930

Fix markdown to improve rendering of markdown doc

Closes #65090

See merge request gitlab-org/gitlab-ce!32744

Backport for EE 15582

See merge request gitlab-org/gitlab-ce!32814

This is a back-port for all CE related files.

Test case implementation for 'File Locking'

Closes gitlab-org/quality/testcases#88 and #13688

See merge request gitlab-org/gitlab-ee!15582

Created a file locking test and added all the needed page objects
and selectors.