[CI Failure] Flaky: AppHostServerSessionTests.GetRpcClientAsync_WhenServerExitsBeforeSocketIsAvailable_FailsWithoutWaitingForConnectionTimeout takes longer than expected on Windows runner

## Build Information

Build: https://github.com/microsoft/aspire/actions/runs/31203621605
Build error leg or test failing: Tests / Hosting.Azure / Hosting.Azure (windows-latest) / `Aspire.Cli.Tests.Projects.AppHostServerSessionTests.GetRpcClientAsync_WhenServerExitsBeforeSocketIsAvailable_FailsWithoutWaitingForConnectionTimeout`
Pull request: #19090

## Error Message

```
Expected RPC connection to fail promptly after the server process exited, but it took 00:00:14.9996920. Timing-sensitive assertion on process exit detection under CI load; test file (Aspire.Cli.Tests) not touched by this PR.
```

## Description

Flaky: AppHostServerSessionTests.GetRpcClientAsync_WhenServerExitsBeforeSocketIsAvailable_FailsWithoutWaitingForConnectionTimeout takes longer than expected on Windows runner

**Type**: flaky-test

## Occurrences

| Date | Build | Job | PR |
|------|-------|-----|----|
| 2026-08-07 | [31203621605](https://github.com/microsoft/aspire/actions/runs/31203621605) | Tests / Hosting.Azure / Hosting.Azure (windows-latest) | #19090 |
| 2026-08-11 | [31468992084](https://github.com/microsoft/aspire/actions/runs/31468992084) | Tests / Cli / Cli (windows-latest) | #19215 |
| 2026-08-17 | [32053958727](https://github.com/microsoft/aspire/actions/runs/32053958727) | Tests / Hosting-2 / Hosting-2 (8-core-ubuntu-latest) | #19400 |

Start with Aspire.Cli.Tests.AppHostServerSessionTests.GetRpcClientAsync_WhenServerExitsBeforeSocketIsAvailable and reproduce the timing-sensitive failure on a Windows runner. Review the listed CI runs and the server-exit assertion; done means the test consistently fails promptly after process exit without waiting for the connection timeout.

Written by the indexing model from the issue text.