[CI Failure] .NET install script SDK download fails with connection closed mid-stream from builds.dotnet.microsoft.com

## Build Information

Build: https://github.com/microsoft/aspire/actions/runs/30776107936
Build error leg: Tests / Hosting.SqlServer / Hosting.SqlServer (windows-latest)
Pull request: #18958

## Error Message

```
dotnet-install: Downloading from "primary" link has failed with error:
Uri: https://builds.dotnet.microsoft.com/dotnet/Sdk/10.0.201/dotnet-sdk-10.0.201-win-x64.zip
Error: Error while copying content to a stream.
Unable to read data from the transport connection: The connection was closed.
Failed to install 'sdk v10.0.201' from any of the specified locations.
```

## Description

.NET install script SDK download fails with connection closed mid-stream from builds.dotnet.microsoft.com

**Type**: infra-failure

## Occurrences

| Date | Build | Job | PR |
|------|-------|-----|----|
| 2026-08-03 | [30776107936](https://github.com/microsoft/aspire/actions/runs/30776107936) | Tests / Hosting.SqlServer / Hosting.SqlServer (windows-latest) | #18958 |

Start with the linked GitHub Actions run 30776107936, especially the Tests / Hosting.SqlServer / Hosting.SqlServer (windows-latest) leg, and inspect the .NET SDK download failure for version 10.0.201. Reproduce or trace the connection-closed error from builds.dotnet.microsoft.com; the issue does not specify a code location or acceptance criteria for determining that it is fixed.

Written by the indexing model from the issue text.