[release/8.0.1xx] Update dependencies from dotnet/arcade

[Copilot]

Problem

Dependency update from dotnet/arcade introduced stricter code analysis rules, causing Linux build failures:

• IDE0044: Field not marked readonly in MockInstallerFactory.cs
• IDE0048: Missing parentheses for clarity in XunitLoggerProvider.cs, CliHostTemplateDataLoader.cs, CliHostDataProducer.cs

Solution

• Updated Microsoft.DotNet.Arcade.Sdk from 8.0.0-beta.25563.4 to 8.0.0-beta.25577.1
• Fixed code analysis violations:
  • Made _factory field readonly
  • Added parentheses around null-coalescing right-hand expressions:

    // Before
    file?.GetDisplayPath() ?? templateInfo.MountPointUri + templateInfo.HostConfigPlace
    // After  
    file?.GetDisplayPath() ?? (templateInfo.MountPointUri + templateInfo.HostConfigPlace)

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

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

• go.microsoft.com
  • Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --depsfile /home/REDACTED/work/templating/templating/artifacts/bin/Microsoft.TemplateSearch.Common.UnitTests/Debug/net8.0/Microsoft.TemplateSearch.Common.UnitTests.deps.json --runtimeconfig /home/REDACTED/work/templating/templating/artifacts/bin/Microsoft.TemplateSearch.Common.UnitTests/Debug/net8.0/Microsoft.TemplateSearch.Common.UnitTests.runtimeconfig.json /home/REDACTED/.nuget/packages/xunit.REDACTED.console/2.4.2/tools/netcoreapp2.0/xunit.console.dll /home/REDACTED/work/templating/templating/artifacts/bin/Microsoft.TemplateSearch.Common.UnitTests/Debug/net8.0/Microsoft.TemplateSearch.Common.UnitTests.dll -noautoreporters -xml /home/REDACTED/work/templating/templating/artifacts/TestResults/Debug/Microsoft.TemplateSearch.Common.UnitTests_net8.0_x64.xml -html /home/REDACTED/work/templating/templating/artifacts/TestResults/Debug/Microsoft.TemplateSearch.Common.UnitTests_net8.0_x64.html (dns block)

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