Workspaces: Admin area
<!--IssueSummary start-->
<details>
<summary>
Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards.
</summary>
- [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=410360)
</details>
<!--IssueSummary end-->
### Problem
Admins have no UI to set up remote development.
### User experience goal
Manage remote development feature in the GitLab interface.
---
### Proposal
Add a section on the groups' Settings for workspaces with
- Guidance on how to set up remote development features,
- Enable/disable workspaces,
- Define default agents for projects,
- Manage limits of workspaces per agent,
- Statistic: number of workspaces per project/agent,
- Set up a sleep time.
<img src="/uploads/4c91b23740aa7ca05adba0bf29a4d4ab/Settings_0.png" width="23%" />
<img src="/uploads/6e5052e74964f27db2c9ef483a12f7e2/Settings_1.png" width="23%" />
<img src="/uploads/80a627b3ddcd4cde45ba5dd4092aca0f/Project_page._Limit_for_project.png" width="23%" />
<img src="/uploads/90cbaa3077dbbd7234845cbfa00fd8a3/Creation_the_workspace._Limit_for_project.png" width="23%" />
### Links
[✿ Figma file (page) →](https://www.figma.com/file/2XmMH4x3cWGBTTnOJaIl6J/Remote-Development?type=design&node-id=486%3A18745&t=orTm3rzxVt26Jl2o-1)
<!-- [❁ Loader page issue →]() -->
---
### Checklist
- [x] Problem is well understood
- [x] Design concept is done
- [ ] Product manager approved
- [ ] Developer (manager) approved
- [ ] All the follow-up issues created
issue