[CI Failure] Polyglot SDK Validation: Java SDK Validation job fails building validation image with exit code 1, unrelated to PR changes; job logs unavailable for detailed diagnosis

## Build Information

Build: https://github.com/microsoft/aspire/actions/runs/32082892403
Build error leg: Tests / Polyglot SDK Validation / Java SDK Validation
Pull request: #19337

## Error Message

```
Process completed with exit code 1. (Build Java validation image step failed; job logs failed to fetch: '(Failed to fetch logs for job 95550474447)'); downstream 'Polyglot Validation Results / Check validation results' job also fails as a result (exit code 1)
```

## Description

Polyglot SDK Validation: Java SDK Validation job fails building validation image with exit code 1, unrelated to PR changes; job logs unavailable for detailed diagnosis

**Type**: infra-failure

## Occurrences

| Date | Build | Job | PR |
|------|-------|-----|----|
| 2026-08-18 | [32082892403](https://github.com/microsoft/aspire/actions/runs/32082892403) | Tests / Polyglot SDK Validation / Java SDK Validation | #19337 |

Start with build 32082892403 and the Tests / Polyglot SDK Validation / Java SDK Validation job, checking whether the validation image build can be rerun and whether logs are available. Compare the failure with the downstream validation-results job; done means the Java validation image builds and both jobs complete successfully without an unrelated exit code 1.

Written by the indexing model from the issue text.