Set $(NuGetAudit) to false in tests

Context: https://github.com/NuGet/docs.microsoft.com-nuget/blob/eed234f4b3edb7358e06cd2370828412a7dbd3f6/docs/concepts/Auditing-Packages.md#configuring-nuget-audit

Some of our test projects give the warning:

    warning NU1902: Package 'Microsoft.AspNetCore.Components' 6.0.0 has a known moderate severity vulnerability, GHSA-3fx3-85r4-8j3w

And then the test fails due to the warning.

Author: jonathanpeppers

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Android/XamarinAndroidApplicationProject.cs

@@ -42,6 +42,7 @@ public XamarinAndroidApplicationProject (string debugConfigurationName = "Debug"
 			SetProperty (KnownProperties.OutputType, "Exe");
 			SetProperty (KnownProperties.Nullable, "enable");
 			SetProperty (KnownProperties.ImplicitUsings, "enable");
+			SetProperty ("NuGetAudit", "False");
 			SetProperty ("XamarinAndroidSupportSkipVerifyVersions", "True");
 			SetProperty ("_FastDeploymentDiagnosticLogging", "True");
 			SupportedOSPlatformVersion = "21.0";