Add option to collect gcdump (MTPv2)

[bart-vmware]

Summary

When a hang or crash occurs when running tests in the C/I environment on macOS, we are unable to analyze the dump file because none of our team members owns a Mac. It would be handy to be able to collect a dump in GCDump format, which can be loaded cross-platform.

Proposed Feature

The currently supported dump types for the --crashdump-type and --hangdump-type parameters are, according to https://learn.microsoft.com/en-us/dotnet/core/testing/microsoft-testing-platform-extensions-diagnostics: Mini, Heap, Triage, Full.

An additional option should be provided to collect a GC (Garbage Collector) dump, similar to how https://learn.microsoft.com/en-us/dotnet/core/diagnostics/dotnet-gcdump works.

[nohwnd]

I am looking for package that could do this without hacks, like we have Microsoft.Diagnostics.NETCore.Client for the normal dump.

[nohwnd]

I asked internally and there is no pre-made package for this, just the dotnet gc-dump tool, and that is 5MB package that we probably don't want to restore for all projects.

[Youssef1313]

I'm not sure if gcdump will be able to help rooting down a crash/hang actually. So it's hard to see if this is something of value that we want to do or not.

When a hang or crash occurs when running tests in the C/I environment on macOS, we are unable to analyze the dump file because none of our team members owns a Mac. It would be handy to be able to collect a dump in GCDump format, which can be loaded cross-platform.

At least for crashes, I think #7168 might be a better option here. I'm not sure if it's possible to have something similar for hangs or not.