[CI Failure] Flaky: DistributedApplicationPipelineTests.WithPipelineStepFactory_MultipleStepsAsyncOverload_ExecutesAllSteps fails with UnauthorizedAccessException during 'destroy' step on Windows

## Build Information

Build: https://github.com/microsoft/aspire/actions/runs/34655355873
Build error leg or test failing: Tests / No-package tests (collection, Aspire.Hosting.Tests, Hosting-4, Hosting-4, tests/Aspire.Hosting.Tests) / Hosting-4 (windows-latest) / `Aspire.Hosting.Tests.Pipelines.DistributedApplicationPipelineTests.WithPipelineStepFactory_MultipleStepsAsyncOverload_ExecutesAllSteps`
Pull request: #20072

## Error Message

```
System.InvalidOperationException : Step 'destroy' failed: Access to the path is denied.
---- System.UnauthorizedAccessException : Access to the path is denied.
at Aspire.Hosting.Pipelines.DistributedApplicationPipeline.ExecuteStepAsync(PipelineStep step, PipelineStepContext stepContext) in /_/src/Aspire.Hosting/Pipelines/DistributedApplicationPipeline.cs:line 1152
```

## Description

Flaky: DistributedApplicationPipelineTests.WithPipelineStepFactory_MultipleStepsAsyncOverload_ExecutesAllSteps fails with UnauthorizedAccessException during 'destroy' step on Windows

**Type**: flaky-test

## Occurrences

| Date | Build | Job | PR |
|------|-------|-----|----|
| 2026-09-11 | [34655355873](https://github.com/microsoft/aspire/actions/runs/34655355873) | Tests / No-package tests (collection, Aspire.Hosting.Tests, Hosting-4, Hosting-4, tests/Aspire.Hosting.Tests) / Hosting-4 (windows-latest) | #20072 |

Start with Aspire.Hosting.Tests.Pipelines.DistributedApplicationPipelineTests.WithPipelineStepFactory_MultipleStepsAsyncOverload_ExecutesAllSteps and the failure path in src/Aspire.Hosting/Pipelines/DistributedApplicationPipeline.cs at line 1152. Run the test on Windows and inspect the destroy step's access-denied behavior. Done means all pipeline steps execute reliably without UnauthorizedAccessException on windows-latest.

Written by the indexing model from the issue text.