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

Add detail to backup_restore omnibus remote storage docs

See merge request !8306

Clarify instructions for importing Wiki/Merge Request data

See merge request !8075

Restore backup correctly when "BACKUP" environment variable is passed

Closes #26090

See merge request !8477

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

Closes #24139

See merge request !8500

For Cycle Analytics, the environment `production` is treated as a
special case, and used to update the `first_deployed_to_production_at`
metric.

With the Review Apps changes, slash syntax is used to group related
environments in the list. This is mostly used for `review/<branch>`
environments, but it's possible for people to have multiple production
environments, and someone might then want to group them like
`production/eu`, `production/us`, or even just make it look prettier
with `production/www.example.com`. In any of these cases, the first
deploy to one of these `production/*` environments now is treated as a
Production deploy.

Make successful pipeline emails off for watchers

Closes #24845

See merge request !8176

Log LDAP blocking/unblocking events to application log

See merge request !8042