[wasm] Fix invariant globalization test (#56121)

[wasm] Fix invariant globalization test (#56121)

The following commit changed the behavior to throw `CultureNotFoundException`
when creating cultures in invariant mode.

```
commit 04dac7b0fede29d44f896c5fd793754f83974175
Author: Tarek Mahmoud Sayed <tarekms@microsoft.com>
Date:   Thu Jul 1 11:55:05 2021 -0700

    Allow restricting cultures creation with any arbitrary names in Globalization Invariant Mode (#54247)
```

This commit updates the corresponding test in `Wasm.Build.Tests` to
handle that explicitly.

Fixes https://github.com/dotnet/runtime/issues/55838