Define helix images using Azure Linux 3.0

[sbomer]

While doing this we should make an effort to keep these images minimal. Some observations about packages we install in the cbl-mariner helix images:

• msquic: We obtain this from the package feeds in Mariner, but I didn't see it in the Azure Linux repos yet.
• gcc: I saw this added in Add Helix image for Mariner 2.0 by wfurt · Pull Request #779 · dotnet/dotnet-buildtools-prereqs-docker (github.com). We should investigate whether this is necessary in the Azure Linux images. I suspect it was required just to build msquic from source.
• llvm: I think this is just because we need llvm-symbolizer to create stacktraces from crash dumps. May be worth trying to just copy over our source-built llvm-symbolizer instead of installing llvm, as @jkoritzinsky suggests in Add llvm-symbolizer to all more helix images by hoyosjs · Pull Request #966 · dotnet/dotnet-buildtools-prereqs-docker (github.com).

Cc'ing a few folks who might be interested or have more context: @richlander @jkoritzinsky @hoyosjs @wfurt

[jander-msft]

Will there be traction on this issue in the near future? The .NET Monitor team would like to test .NET Monitor on Azure Linux 3.0 in Helix.