[release/9.0-rc2] Suppress SYSLIB5005 for System.Formats.Nrbf as experimental

[github-actions]

Backport of #12156 to release/9.0-rc2

/cc @lonitra @jeffhandley

Customer Impact

We are marking the System.Formats.Nrbf APIs as [Experimental] in .NET 9 to leave the door open for making API changes in the next release. Since WinForms consumes these APIs, we need to suppress the diagnostic that will occur.

Testing

Created a local build of System.Formats.Nrbf with the assembly marked as [Experimental], consumed that build into the WinForms solution for all references, and found the projects that need to have the suppression in place.

Risk

Low. Suppressing a diagnostic that will be introduced in RC2.

Microsoft Reviewers: Open in CodeFlow

[jeffhandley]

@lonitra I don't have permission to edit the issue description, but here's the template. It was already discussed and approved in Tactics.

Customer Impact

We are marking the System.Formats.Nrbf APIs as [Experimental] in .NET 9 to leave the door open for making API changes in the next release. Since WinForms consumes these APIs, we need to suppress the diagnostic that will occur.

Testing

Created a local build of System.Formats.Nrbf with the assembly marked as [Experimental], consumed that build into the WinForms solution for all references, and found the projects that need to have the suppression in place.

Risk

Low. Suppressing a diagnostic that will be introduced in RC2.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.81742%. Comparing base (f1676f5) to head (83c1f9e).
Report is 2 commits behind head on release/9.0-rc2.

Additional details and impacted files

@@                    Coverage Diff                    @@
##           release/9.0-rc2      #12162         +/-   ##
=========================================================
+ Coverage         74.81314%   74.81742%   +0.00427%     
=========================================================
  Files                 3022        3022                 
  Lines               630138      630138                 
  Branches             46785       46785                 
=========================================================
+ Hits                471426      471453         +27     
+ Misses              155322      155308         -14     
+ Partials              3390        3377         -13     

Flag	Coverage Δ
Debug	74.81742% <ø> (+0.00427%)	⬆️
integration	18.03116% <ø> (+0.01445%)	⬆️
production	47.83499% <ø> (+0.00949%)	⬆️
test	97.00759% <ø> (ø)
unit	44.83952% <ø> (-0.01793%)	⬇️

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