[CI Failure] Dashboard (ubuntu-latest) test run fails with exit code 2, unrelated to PR changes

## Build Information

Build: https://github.com/microsoft/aspire/actions/runs/31762325235
Build error leg: Tests / Dashboard / Dashboard (ubuntu-latest)
Pull request: #19371

## Error Message

```
Process completed with exit code 2. (Run tests (Linux/macOS) step failed; detailed job logs unavailable)
```

## Description

Dashboard (ubuntu-latest) test run fails with exit code 2, unrelated to PR changes

**Type**: flaky-test

## Occurrences

| Date | Build | Job | PR |
|------|-------|-----|----|
| 2026-08-14 | [31762325235](https://github.com/microsoft/aspire/actions/runs/31762325235) | Tests / Dashboard / Dashboard (ubuntu-latest) | #19371 |

Start with build 31762325235 and the Tests / Dashboard / Dashboard (ubuntu-latest) job, focusing on the failed Run tests (Linux/macOS) step. Reproduce or obtain detailed logs for the exit-code-2 failure; done means the dashboard test run completes reliably and the cause is understood rather than attributed only to the PR.

Written by the indexing model from the issue text.