Disable WER for host test apps that intentionally crash

[elinor-fung]

Call SetErrorMode with NOGPFAULTERRORBOX per @MichalStrehovsky's suggestion in #116725 (comment)

This disables dumps for the tests that intentionally crash when we are crashing from the app. For something like Muxer_NonAssemblyWithExeExtension where there is no test-specific code running, we don't have anywhere to hook in to do this, so that still ends up with a dump. But this change at least gets rid of the other ones.

cc @dotnet/appmodel @AaronRobinsonMSFT

[Copilot]

Pull Request Overview

This PR disables Windows error reporting for host test applications that intentionally crash by calling SetErrorMode with the NOGPFAULTERRORBOX flag.

• Disables core dumps for specific Windows tests
• Adds Windows-specific error mode handling in CoreDump.cs

Comments suppressed due to low confidence (1)

src/installer/tests/Assets/Projects/CoreDump.cs:37

• [nitpick] Consider adding a brief inline comment explaining why SetErrorMode is called with NOGPFAULTERRORBOX on Windows to improve maintainability and clarify intent for future reviewers.

            else if (OperatingSystem.IsWindows())

[dotnet-policy-service]

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