resolve "Status icons overlap sidebar on mobile"

What does this MR do?

render sidebar over the top of main content area

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

• do we have tests for this sort of thing?
• or z-index rules

Why was this MR needed?

Screenshots (if relevant)

Pipeline icons being below sidebar:

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] 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 #30587 (closed)