Docs update on SAML SSO improvements

See merge request gitlab-org/gitlab-ee!11391

Update dependency @gitlab/ui to ^3.4.0

See merge request gitlab-org/gitlab-ce!27590

Revert Rails.application.env_config after using mock_auth_hash

See merge request gitlab-org/gitlab-ce!27596

Revert Rails.application.env_config after using mock_auth_hash

Closes #11278

See merge request gitlab-org/gitlab-ee!11442

[CE] Use presenter for labels in UI

See merge request gitlab-org/gitlab-ce!27374

When rendering a label we want to check 'scoped_label' feature
availability on a project/group where label is being used. For
this reason a label presenter is used in UI and information about
context project/group is passed to this presenter.

Use presenter for labels in UI

Closes #10922

See merge request gitlab-org/gitlab-ee!10862

When rendering a label we want to check 'scoped_label' feature
availability on a project/group where label is being used. For
this reason a label presenter is used in UI and information about
context project/group is passed to this presenter.

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

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

Geo - Include the functionality of :delete in :geo_fdw tag

See merge request gitlab-org/gitlab-ee!11163

Provide a new gitlab:seed:issues task

See merge request gitlab-org/gitlab-ce!27454

Provide new gitlab:seed:issues and gitlab:seed:insights:issues tasks

Closes #11199

See merge request gitlab-org/gitlab-ee!11120

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Merge branch '11274-the-geo-db-test-prepare-rake-task-is-broken-after-upgrade-to-rails-5-1' into 'master'

Use #load_schema instead instead of #load_schema_for

Closes #11274

See merge request gitlab-org/gitlab-ee!11430

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Update proofreader.md - add simplified chinese proofreader

See merge request gitlab-org/gitlab-ce!27568

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