Fix empty state for build that does not have a trace

What does this MR do?

This merge request fixes empty states for a build that might not have a trace yet.

It also implements a fallback illustration (empty job, no message) to cover other edge cases that might surface in the future.

Screenshots

Does this MR meet the acceptance criteria?

• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend

What are the relevant issue numbers?

Closes gitlab-org/gitlab-ce#45204