Support NuGetAuditWarningAsError to simplify treat audit warnings as errors

[WeihanLi]

NuGet Product(s) Involved

NuGet.exe

The Elevator Pitch

When we want to treat audit warnings as errors we have to set each error code to the WarningsAsErrors list, it's not easy to know all the error codes and it's possible to introduce a new error code, is it?

Wondering if we could introduce NuGetAuditWarningAsError to simplify treat all nuget audit warnings as errors

Additional Context and Details

No response

[nkolev92]

@WeihanLi

I don't think we're likely to introduce new error codes at this point, I think depending on NU1901-NU1904 is pretty safe.

[WeihanLi]

Think it could still make the warnings as errors more simple, feel free to close if we do not think it's a need

[nkolev92]

We'll discuss it during triage, but I'm not opposed to it, I just wanted to give you more confidence in your current options.

https://learn.microsoft.com/en-us/nuget/concepts/auditing-packages#warning-codes does talk about warning code elevation.