fail: Application has finished but XHarness failed to determine its exit code!

Sometimes, XHarness fails to determine exit code from test run on Apple devices (investigate if happens on other platforms as well) and fails with:

```
fail: Application has finished but XHarness failed to determine its exit code!
...
XHarness exit code: 82 (RETURN_CODE_NOT_SET)
```

Happened for example in build https://dev.azure.com/dnceng-public/public/_build/results?buildId=642460&view=logs&j=28c2a171-0c43-5d2a-7ef1-2d2cea8331ba&t=3df1997a-11aa-5246-c452-91536bb3018b for `tvos-arm64 Release AllSubsets_Mono_RuntimeTests` job ([helix log](https://helixre107v0xdeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-heads-main-a8319a2ff8c145ed82/GC_Regressions.Attempt.3/1/console.c81f06e3.log?helixlogtype=result)).