Resolve "Banner to enable Auto DevOps at project level"

What does this MR do?

Creates a callout for auto devops and shows it in the following pages:

• projects:merge_requests:index
• projects:show
• projects:pipelines:index
• projects:tree:show

Updates the UserCallout class to store this cookie with a path.

The callout should only be visible in the following conditions:

• you are Master for project AND backend
• the dismiss cookie is not set AND frontend
• the project setting is use default AND backend
• the application setting is off backend

Screenshots (if relevant)

merge_request	tree	project	pipelines

Screenshots do not yet reflect correct "auto devops" wording (so without a space between "dev" and "ops"), but this is implemented in the code.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] Documentation created/updated
• [ ] API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • [ ] Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

Closes #37158