This MR enables rendering of PlantUML diagrams in Asciidoc documents. To add a
PlantUML diagram all we need is to include a plantuml block like:

```
[plantuml, id="myDiagram", width="100px", height="100px"]
--
bob -> alice : ping
alice -> bob : pong
--
```

The plantuml block is substituted by an HTML img element with *src* pointing to
an external PlantUML server.

This MR also add a PlantUML integration section to the Administrator -> Settings
page to configure the PlantUML rendering service and to enable/disable it.

Closes: #17603

Refactor admin controllers params

See merge request !8521

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

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

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

Fix Users API to accept confirm parameter

Closes #26295

See merge request !8531

Add detail to backup_restore omnibus remote storage docs

See merge request !8306

Keep max width on MR content on side by side view

Closes #25907

See merge request !8467

Resolve "Alerts should be responsive"

Closes #25776

See merge request !8424

Update templates - 8.16 RC1

See merge request !8505

Fix Rubocop configuration files to avoid CE to EE merge problems

See merge request !8525

Centered alert text and prevented alert actions links from floating
right for viewports below medium width (992px)

Centered alert text stopped alert actions from floating right for viewports below medium width (992px)

Update styles to use correct screen width variable for max-width media query

Added unreleased changelog

Added class to alert links wrapper
Updated styles for new class, float alert links on larger screens

Updated Turbolinks to patched version of turbolinks-classic

See https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2048

Clarify instructions for importing Wiki/Merge Request data

See merge request !8075

Display project avatars on Admin Area and Projects pages for mobile views

See merge request !8506

26504 Fix styling of MR jump to discussion button

Closes #26504

See merge request !8511

[ci skip]

[ci skip]

Fix Rubocop offenses on `master`

See merge request !8516

fix changelog entry for !8425

See merge request !8512

Update rubocop and rubocop-rspec to fix build errors

See merge request !8466

Restore backup correctly when "BACKUP" environment variable is passed

Closes #26090

See merge request !8477

the author and mr fields got swapped,
see https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8425#note_21021254

Treat environments matching `production/*` as Production for Cycle Analytics

Closes #24139

See merge request !8500

Resolve "Add link to Branches page help text?"

Closes #26129

See merge request !8377

[ci skip]

Pipelines Vue

See merge request !7196

Validate label's title length

See merge request !5767

Update the gitlab-markup gem to the version `1.5.1`

See merge request !8509

Remove the project_authorizations.id column

See merge request !8479

Change CI template linter textarea with Ace Editor

Closes #24179 and #19701

See merge request !8452