[lbussell]

Motivation

• Update-dependencies tool relies too heavily on Set-DotNetVersions.ps1 and Get-DropVersions.ps1 to construct the correct set of arguments for update operations. It is desirable to use .NET for this instead.
• As part of Consume .NET 10 builds from VMR instead of dotnet/sdk #6363, we need to write/rewrite new logic to enable consuming builds from the VMR. The options were to write more PowerShell scripts or to refactor parts of this tool to enable consuming those VMR builds. Re-factoring this tool means we can easily use pre-existing .NET libraries written by the product construction team, so this is the preferred approach.
• So ultimately, update-dependencies needs to provide a way to define additional entrypoints (new subcommand(s)) that can call into the existing update-dependencies logic.

Details

• The old root command (update-dependencies) is now a sub-command called "specific"
  • Intended usage:
    • update-dependencies specific 10.0 --product-version foo=bar ...
  • Potential future usage:
    • update-dependencies from-channel 4567 https://github.com/dotnet/dotnet
    • update-dependencies from-builds 123456
    • update-dependencies from-builds 123456 133337 ...
    • ...We can just infer product versions and Dockerfile versions from the BAR builds
• New sub-commands can instantiate SpecificCommand and call it using arguments, or use any of the other existing classes to facilitate updating versions, e.g. DockerfileShaUpdater.CreateUpdaters(...) ...

Other changes

• System.CommandLine 2.0.0 Beta 5
  • No, this is not out yet, but presumably it will be soon. Once I learned there was a version 5, I didn't want to write new code in an older version. This project now references the dotnet-libraries nuget feed in order to get it.
  • Standard dependency injection setup which will allow services to be injected into individual command classes
  • Some boilerplate to handle command setup and registration
  • Use System.CommandLine.NamingConventionBinder to bind options to properties

Fixes #3899... sorta.