Docs: review MR !27275

Closes #60631

See merge request gitlab-org/gitlab-ce!27585

Job artifact documentation: Added list of textual formats

Closes #56801

See merge request gitlab-org/gitlab-ce!27430

!22112 added the latest extension to this list, .log meaning
that this doc extension is valid for version >= 11.5

Closes #56801

Use Gitea logo for importer

Closes #48842

See merge request gitlab-org/gitlab-ce!27424

CE backport: "Move EE differences for app/views/projects/issues/show.html.haml"

See merge request gitlab-org/gitlab-ce!27440

app/views/projects/issues/show.html.haml"

Remove related items CSS properties and add utility classes

See merge request gitlab-org/gitlab-ce!27583

Externalize left sidebar strings

See merge request gitlab-org/gitlab-ce!27532

Introduce ServiceResponse to wrap around response

Closes #60730

See merge request gitlab-org/gitlab-ce!27516

Bring Slack app docs to CE and add tiers

See merge request gitlab-org/gitlab-ce!27598

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

[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.

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

Provide a new gitlab:seed:issues task

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

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Update proofreader.md - add simplified chinese proofreader

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

Support negative matches

See merge request gitlab-org/gitlab-ce!27510

Fix issue with list label text color

Closes #47584

See merge request gitlab-org/gitlab-ce!26794

Add feature flag to disable LFS check

Closes #60588

See merge request gitlab-org/gitlab-ce!27451

This adds support for != and !~ operators
giving more flexibility in comparing values

Add whitespace for list so it renders

See merge request gitlab-org/gitlab-ce!27564

Upgrade Rails to 5.1

See merge request gitlab-org/gitlab-ce!27480

Add auto_ssl_enabled to pages domains

See merge request gitlab-org/gitlab-ce!27304

Make it clearer when CI_MERGE_REQUEST_ variables are available

Closes #60308

See merge request gitlab-org/gitlab-ce!27460