Resolve "Prometheus loading screen no longer seems to appear"

What does this MR do?

Fixes the broken asset paths for empty state SVG illustrations used within the ~Prometheus monitoring page.

This was not noticed before because in the GDK, incorrect asset paths are a lot more forgiving. Forgetting to include a file extension in an image path will still work locally, but in production it will not. Adding the file extension causes the url to be generated correctly.





Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #40285 (closed)

Edited by Tim Zallmann

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