Host work in .NET 8

[agocke]

In .NET 8, we want to improve the hosting space in three main areas:

User experience

.NET hosting is the entry point for both the end-user experience of running an application and the developer experience of building one. There is often a fair amount of overlap with SDK work.

• Use cross-platform code to update apphost win32 resources, open apphost only once for writing #3828
• Update global.json default SDK roll-forward behaviour #77614
• .NET 8: Host improvements #71284
• Use modern-themed buttons in the host error message box. #71288

Developer building blocks

This is functionality related to hosting a .NET runtime that enable developers to better integrate with the runtime. Pain points with custom hosting often revolve around interactions with assembly load contexts - building out this capability will alleviate this and help users move away from older / Windows-only platforms like .NET Framework and C++/CLI.

• Pass callback from host to runtime for getting properties from the host #77458
• Add the ability for a native host to load an assembly and specify the load context #77696
• COMHost/ComActivator without separate AssemblyLoadContext #66013

Fundamentals

Test infrastructure (steps towards #77800)

• Move startup hook tests targeting StartupHookProvider out of hosting tests #77805
• Collapse/remove projects under src/installer/tests/Assets/TestProjects #77807

Single-file testing strategy

• Design and implement robust testing story for single-file #80369

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Issue Details

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Author:	agocke
Assignees:	-
Labels:	area-Host
Milestone:	-

[agocke]

Closing as completed.