Explanation for UseSystemResourceKeys=false (dotnet#94054)

Author: ilonatommy

src/mono/wasm/Wasm.Build.Tests/IcuTestsBase.cs

@@ -108,6 +108,7 @@ protected void TestIcuShards(BuildArgs buildArgs, string shardName, string teste
         bool dotnetWasmFromRuntimePack = !(buildArgs.AOT || buildArgs.Config == "Release");
 
         buildArgs = buildArgs with { ProjectName = projectName };
+        // by default, we remove resource strings from an app. ICU tests are checking exception messages contents -> resource string keys are not enough
         string extraProperties = $"<WasmIcuDataFileName>{shardName}</WasmIcuDataFileName><UseSystemResourceKeys>false</UseSystemResourceKeys>";
         if (onlyPredefinedCultures)
             extraProperties = $"{extraProperties}<PredefinedCulturesOnly>true</PredefinedCulturesOnly>";
@@ -125,4 +126,4 @@ protected void TestIcuShards(BuildArgs buildArgs, string shardName, string teste
 
         string runOutput = RunAndTestWasmApp(buildArgs, buildDir: _projectDir, expectedExitCode: 42, host: host, id: id);
     }
-}
+}