nuget restore warnings can't be suppressed with NoWarn in Visual Studio

[FixBo]

NuGet Product Used

Visual Studio Package Management UI, Visual Studio Package Manager Console

Product Version

17.10

Worked before?

17.9

Impact

It's more difficult to complete my work

Repro Steps & Context

Add multiple nuget sources and set ManagePackageVersionsCentrally to true.

Visual Studio show restore error even if <NoWarn>NU1507</NoWarn> specified for project.

There is no issues when using dotnet restore or msbuild.

Only legacy projects type affected.

Verbose Logs

NU1507: Warning As Error: There are 2 package sources defined in your configuration. When using central package management, please map your package sources with package source mapping (https://aka.ms/nuget-package-source-mapping) or specify a single package source. The following sources are defined: nuget.org, dotnet-tools
Failed to restore ****** (in 1,08 sec).
NuGet package restore failed. Please see Error List window for detailed warnings and errors.

[FixBo]

NuGet/NuGet.Client#5869