Reenable Publish_HostingMultipleBlazorWebApps_Works test

The test `Microsoft.NET.Sdk.BlazorWebAssembly.Tests.WasmPublishIntegrationTest.Publish_HostingMultipleBlazorWebApps_Works` is failing with a duplicate key error in the `DiscoverPrecompressedAssets` task:

```
error MSB4018: The "DiscoverPrecompressedAssets" task failed unexpectedly.
System.ArgumentException: An item with the same key has already been added.
Key: ...\BlazorMultipleApps.Shared\bin\Debug\netstandard2.1\BlazorMultipleApps.Shared.pdb
```

This was observed in codeflow PR https://github.com/dotnet/sdk/pull/53613#issuecomment-4184244444.

The fix has been merged in https://github.com/dotnet/runtime/pull/126211. This requires a rebootstrap to pick up the fix. The test should be re-enabled once a new bootstrap SDK is available that includes the fix.