[dotnet/sdk-gen] Fixes potential conflicts when generating resources called System

[Zaid-Ajaj]

Description

When generating a C# package that has a resource called System, it fails to compile when we fully qualify System.Diagnostics.CodeAnalysis.SuppressMessage in the generated Config.cs file since it thinks that System.Diagnostics is referring to a static class on the System resource definition.

The fix is to prefix the attribute with global:: so that type resolution works as expected.

Checklist

• I have run make tidy to update any new dependencies
• I have run make lint to verify my code passes the lint check
  • I have formatted my code using gofumpt

• I have added tests that prove my fix is effective or that my feature works

• I have run make changelog and committed the changelog/pending/<file> documenting my change

• Yes, there are changes in this PR that warrants bumping the Pulumi Cloud API version

[pulumi-bot]

Changelog

[uncommitted] (2023-09-22)

Bug Fixes

• [sdkgen/dotnet] Fixes potential conflicts when generating resources called System
  #14011