[CI Failure] Flaky: DownloadFailingJobLogsToolTests.ReportsMissingArtifactWithoutFailing assertion mismatch

## Build Information

Build: https://github.com/microsoft/aspire/actions/runs/32781735084
Build error leg or test failing: Tests / Infrastructure / Infrastructure (ubuntu-latest) / `Infrastructure.Tests.DownloadFailingJobLogsToolTests.ReportsMissingArtifactWithoutFailing`
Pull request: #19624

## Error Message

```
Assert.Equal() Failure: Values differ
Expected: 0
Actual: 1
at Infrastructure.Tests.DownloadFailingJobLogsToolTests.ReportsMissingArtifactWithoutFailing() in /_/tests/Infrastructure.Tests/DownloadFailingJobLogs/DownloadFailingJobLogsToolTests.cs:line 81
```

## Description

Flaky: DownloadFailingJobLogsToolTests.ReportsMissingArtifactWithoutFailing assertion mismatch

**Type**: flaky-test

## Occurrences

| Date | Build | Job | PR |
|------|-------|-----|----|
| 2026-08-24 | [32781735084](https://github.com/microsoft/aspire/actions/runs/32781735084) | Tests / Infrastructure / Infrastructure (ubuntu-latest) | #19624 |

Start with tests/Infrastructure.Tests/DownloadFailingJobLogs/DownloadFailingJobLogsToolTests.cs, especially DownloadFailingJobLogsToolTests.ReportsMissingArtifactWithoutFailing at line 81. Run that test and inspect the missing-artifact handling and related test setup; done means the test reliably passes while still verifying the expected non-failing result.

Written by the indexing model from the issue text.