EE: Backport EE changes to config/application.rb

See merge request gitlab-org/gitlab-ee!14093

Add index to events and audit_events tables

Closes gitlab-com/Product#309

See merge request gitlab-org/gitlab-ce!29194

Update GraphQL document to mention that epics are supported

See merge request gitlab-org/gitlab-ce!29777

Add note about nested variables for GIT_CLONE_PATH

See merge request gitlab-org/gitlab-ce!29590

The variable $GIT_CLONE_PATH does not support nested variables, it will
only expand the variables once, not more.

reference https://gitlab.com/gitlab-org/gitlab-runner/issues/4319

[QA] Test push limit with admin user

Closes gitlab-org/quality/staging#37

See merge request gitlab-org/gitlab-ce!29036

Uses `:requires_admin` metadata to specify that a test needs
an admin user.

Sets the push file size limit test to require an admin user.

With an admin access token set as the env var
GITLAB_QA_ADMIN_ACCESS_TOKEN, the push size
limit test now only uses the API and CLI

Fixing an old quarantined test

Closes gitlab-org/quality/staging#50

See merge request gitlab-org/gitlab-ce!28643

Use Flipper as an A/B testing framework

Closes growth#79

See merge request gitlab-org/gitlab-ee!13755

Resolve "Geo: Make hashed storage a hard requirement in 12.0"

Closes #8690

See merge request gitlab-org/gitlab-ee!14102

FlipperSession is designed to be used with
Feature (and Flipper) to allow A/B style testing
for anonymous users.

FlipperSessionHelper leverages FlipperSession.

Allow switching clusters between managed/unmanaged

Closes #60617

See merge request gitlab-org/gitlab-ce!29322

Make Kubernetes service templates readonly

See merge request gitlab-org/gitlab-ce!29044

We are deprecating this service in favor of instance wide clusters.
Therefore we removed some code that is not anymore needed for a
readonly cluster and also we added some flags to allow for this
deprecation. These flags are to be removed in the next release when
we finally completelly remove KubernetesService.

EE port of "Make Kubernetes service templates readonly"

See merge request gitlab-org/gitlab-ee!13937

We are deprecating this service in favor of instance wide clusters.
Therefore we removed some code that is not anymore needed for a
readonly cluster and also we added some flags to allow for this
deprecation. These flags are to be removed in the next release when
we finally completelly remove KubernetesService.

Migrate Kubernetes service integration templates to clusters

See merge request gitlab-org/gitlab-ce!28534

Index on created_at, author_id

Updated docs for Merge Trains

See merge request gitlab-org/gitlab-ce!29771

Any resources created while the cluster was managed
will be untouched, allowing users to set/unset this
flag as they please.

Don't use Kubernetes namespaces with no token

See merge request gitlab-org/gitlab-ce!29643

Add index on invite-email to members

See merge request gitlab-org/gitlab-ce!29768

CE port of "Add test for git http operations for SSO enforced SAML group"

See merge request gitlab-org/gitlab-ce!29550

[CE] Validate page after visit in block

See merge request gitlab-org/gitlab-ce!29524

[EE] Validate page after visit in block

Closes gitlab-ce#62062

See merge request gitlab-org/gitlab-ee!13994

Expose currently supported events properly on services API

Closes #56737

See merge request gitlab-org/gitlab-ce!29736

Refresh service_account_token for kubernetes_namespaces

See merge request gitlab-org/gitlab-ce!29657

note that todos are not affected by GitLab Notification Email settings

See merge request gitlab-org/gitlab-ce!29539