Update NuGetCommands commands in XPlat to debug mode only

[Nigusu-Allehu]

Bug

Fixes: #6804 (comment)

Description

Update XPlat debug commands to be registered only during DEBUG builds.

• The NuGetCommands class is used by the .NET SDK CLI to register NuGet commands. https://github.com/NuGet/NuGet.Client/blob/dev/src/NuGet.Core/NuGet.CommandLine.XPlat/NuGetCommands.cs
• Currently, it is implemented only by the update command, but future dotnet nuget client commands will also use this class.
• To support live debugging, these commands are registered in the NuGet.CommandLine.XPlat entry point.
• Since this registration is intended solely for debugging, this PR ensures the commands are registered only in debug builds.

PR Checklist

• Meaningful title, helpful description and a linked NuGet/Home issue
• Added tests
• Link to an issue or pull request to update docs if this PR changes settings, environment variables, new feature, etc.

[martinrrm]

Interesting... I wasn't aware that we needed to add the register if we wanted to debug the update command, thanks you potentially saved us time for future development.

Also, consider updating the title to say UpdateCommand only, I thought this was for all.

[jebriede]

Interesting... I wasn't aware that we needed to add the register if we wanted to debug the update command, thanks you potentially saved us time for future development.

Also, consider updating the title to say UpdateCommand only, I thought this was for all.

I agree with the suggestion to update the title to explain which command is being addressed.

[Nigusu-Allehu]

Interesting... I wasn't aware that we needed to add the register if we wanted to debug the update command, thanks you potentially saved us time for future development.

Also, consider updating the title to say UpdateCommand only, I thought this was for all.

Thanks for the note! I used NuGetCommands in the title because the intent is for this change to apply it to all commands registered under NuGetCommands. Right now, only the Update Command implements it, which is why it looks specific to that one. But the goal is to make the pattern consistent for all future NuGetCommands commands.