Enable/disable Auto DevOps at the Group level

What does this MR do?

Add an option to Group settings to enable/disable Auto DevOps

EE port: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9862

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/52447

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR - https://gitlab.com/gitlab-org/gitlab-ce/issues/58810
• [-] Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• [-] Security reports checked/validated by reviewer

Backend Todo

• Add auto_devops_enabled boolean on namespaces. Move to another MR? Will move migration to another MR if this MR gets too large.
• UI changes to add Auto DevOps form into Group CI/CD settings
• Controller integration
• Subgroups integration
• Delegate to subgroup -> group -> instance when necessary
• Modify product ADO badge accordingly
• Feature specs
• Refactor 🤕
• Manual QA

Screenshots

Group enabled (by instance)	Group enabled (by group itself)	Group disabled

Project enabled (by instance)	Project enabled (by group)	Project disabled

Manual QA

Creating group	Disabling group	Enabling group
manual-qa-new-group	manual-qa-disable-group	manual-qa-enable-group

Disabling group with projects	Enabling group with projects
manual-qa-disable-group-disable-project	manual-qa-enable-group-enable-project