Summary

• avoid using StreamReader.EndOfStream in the async run-log parser
• use ReadLineAsync() as the loop condition to satisfy CA2024

Testing

• dotnet build src\Microsoft.DotNet.XHarness.iOS.Shared\Microsoft.DotNet.XHarness.iOS.Shared.csproj -nologo -v:minimal -p:NetMinimum=net10.0 -p:EnableNETAnalyzers=true -p:AnalysisLevel=latest -warnaserror:CA2024
• dotnet test tests\Microsoft.DotNet.XHarness.iOS.Shared.Tests\Microsoft.DotNet.XHarness.iOS.Shared.Tests.csproj -nologo -v:minimal -p:NetMinimum=net10.0