[release/8.0.4xx] Update dependencies from dotnet/arcade

[Copilot]

Problem

Dependency update from dotnet/arcade (8.0.0-beta.25563.4 → 8.0.0-beta.25574.4) introduced stricter analyzer rules, causing Linux build failures:

• IDE0044: Field _factoryId in MockInstallerFactory.cs should be readonly
• IDE0048: Missing parentheses for operator precedence clarity in XunitLoggerProvider.cs

Solution

• Added readonly modifier to _factoryId field
• Added parentheses around null-coalescing expression:

  // Before: ambiguous operator precedence
  firstLinePrefix + lines.FirstOrDefault() ?? string.Empty
  
  // After: explicit grouping
  firstLinePrefix + (lines.FirstOrDefault() ?? string.Empty)

• Removed accidentally added nuget.exe and added .nuget/ to .gitignore to prevent future occurrences

Checks:

• Added unit tests

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• k4kvsblobprodcus344.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/templating/templating/Microsoft.TemplateEngine.sln --packages /home/REDACTED/work/templating/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/templating/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/templating/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)
• n3kvsblobprodcus335.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/templating/templating/Microsoft.TemplateEngine.sln --packages /home/REDACTED/work/templating/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/templating/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/templating/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)
• o3svsblobprodcus318.vsblob.vsassets.io
  • Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet msbuild /m /nologo /clp:Summary /v:minimal /nr:true /warnaserror /p:TreatWarningsAsErrors=true /p:ContinuousIntegrationBuild=false /home/REDACTED/work/templating/templating/artifacts/toolset/restore.proj /bl:/home/REDACTED/work/templating/templating/artifacts/log/Debug/ToolsetRestore.binlog /t:__WriteToolsetLocation /clp:ErrorsOnly;NoSummary /p:__ToolsetLocationOutputFile=/home/REDACTED/work/templating/templating/artifacts/toolset/8.0.0-beta.25574.4.txt (dns block)
  • Triggering command: /usr/bin/dotnet dotnet build test/Microsoft.TemplateEngine.Mocks/Microsoft.TemplateEngine.Mocks.csproj (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/templating/templating/Microsoft.TemplateEngine.sln --packages /home/REDACTED/work/templating/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/templating/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/templating/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)
• rcxvsblobprodcus328.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build test/Microsoft.TemplateEngine.Mocks/Microsoft.TemplateEngine.Mocks.csproj (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[marcpopMSFT]

@copilot don't add nuget.exe to a repo ever. Please remove that from history as well, don't just revert.

[Copilot]

@copilot don't add nuget.exe to a repo ever. Please remove that from history as well, don't just revert.

Removed nuget.exe in commit ee7a87b and added .nuget/ to .gitignore to prevent this in the future. Note: I'm unable to rewrite git history (force push is not available in my environment), so the file was removed via a new commit rather than being removed from history entirely.