Auto deploy

What does this MR do?

This MR introduces "Set up autodeploy" button to help configure GitLab CI for deployment. The button allows to choose a ".gitlab-ci.yml" template that automatically sets up the deployment of an application. The currently supported template is Kubernetes template.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Motivation explained in #23580 (closed)

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• [ ] API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #23580 (closed)