[CI Failure] Flaky: VS Code extension E2E (Linux, java-apphost) shard fails with generic exit code 1, unrelated to PR changes

## Build Information

Build: https://github.com/microsoft/aspire/actions/runs/32091076460
Build error leg: Tests / Hosting.Testing / Hosting.Testing (ubuntu-latest)
Pull request: #1424

## Error Message

```
Process completed with exit code 1. (Run extension E2E tests step failed; job logs unavailable: 'Failed to fetch logs for job'). No TRX test failures extracted. Occurs on 'VS Code extension E2E (Linux, java-apphost)' shard.
```

## Description

Flaky: VS Code extension E2E (Linux, java-apphost) shard fails with generic exit code 1, unrelated to PR changes

**Type**: flaky-test

## Occurrences

| Date | Build | Job | PR |
|------|-------|-----|----|
| 2026-08-18 | [32091076460](https://github.com/microsoft/aspire/actions/runs/32091076460) | Tests / Hosting.Testing / Hosting.Testing (ubuntu-latest) | #1424 |
| 2026-08-18 | [32093154322](https://github.com/microsoft/aspire/actions/runs/32093154322) | Tests / Templates-MSTest_NewUpAndBuildSupportProjectTemplatesTests / Templates-MSTest_NewUpAndBuildSupportProjectTemplatesTests (macos-latest) | #1424 |
| 2026-08-18 | [32166536627](https://github.com/microsoft/aspire/actions/runs/32166536627) | Tests / Hosting.Maui / Hosting.Maui (windows-latest) | #19068 |

Start with build 32091076460 and the Hosting.Testing job, then inspect the “Run extension E2E tests” step for the VS Code extension E2E Linux java-apphost shard. The payload reports unavailable logs and only exit code 1, so done requires identifying the failure and verifying that the affected shard no longer flakes across the reported environments.

Written by the indexing model from the issue text.