[CI Failure] Flaky: AspireRabbitMQLoggingTests.TestExceptionWithoutInnerException fails with empty collection

## Build Information

Build: https://github.com/microsoft/aspire/actions/runs/29456677302
Build error leg or test failing: Tests / RabbitMQ.Client.v6 / RabbitMQ.Client.v6 (windows-latest) / `Aspire.RabbitMQ.Client.Tests.AspireRabbitMQLoggingTests.TestExceptionWithoutInnerException`
Pull request: #18799

## Error Message

```
Assert.Single() Failure: The collection was empty
at Aspire.RabbitMQ.Client.Tests.AspireRabbitMQLoggingTests.TestExceptionWithoutInnerException() in /_/tests/Aspire.RabbitMQ.Client.Tests/AspireRabbitMQLoggingTests.cs:line 164
```

## Description

Flaky: AspireRabbitMQLoggingTests.TestExceptionWithoutInnerException fails with empty collection

**Type**: flaky-test

## Occurrences

| Date | Build | Job | PR |
|------|-------|-----|----|
| 2026-07-15 | [29456677302](https://github.com/microsoft/aspire/actions/runs/29456677302) | Tests / RabbitMQ.Client.v6 / RabbitMQ.Client.v6 (windows-latest) | #18799 |

Start with tests/Aspire.RabbitMQ.Client.Tests/AspireRabbitMQLoggingTests.cs, especially TestExceptionWithoutInnerException at line 164, and reproduce the Windows CI failure from build 29456677302. Check why the collection is empty when Assert.Single runs; done means the test reliably observes the expected single result without flaking.

Written by the indexing model from the issue text.