[wasm] AOT BCL tests using -O1 to avoid OOM errors on CI.

Also enable WasmNativeStrip.

Author: vargaz

eng/testing/tests.wasm.targets

@@ -176,7 +176,8 @@
     <PropertyGroup>
       <_MainAssemblyPath Condition="'%(WasmAssembliesToBundle.FileName)' == $(AssemblyName) and '%(WasmAssembliesToBundle.Extension)' == '.dll'">%(WasmAssembliesToBundle.Identity)</_MainAssemblyPath>
       <RuntimeConfigFilePath>$([System.IO.Path]::ChangeExtension($(_MainAssemblyPath), '.runtimeconfig.json'))</RuntimeConfigFilePath>
-      <EmccLinkOptimizationFlag Condition="'$(EmccLinkOptimizationFlag)' == ''">-Oz -Wl,-O0 -Wl,-lto-O0</EmccLinkOptimizationFlag>
+      <EmccLinkOptimizationFlag Condition="'$(EmccLinkOptimizationFlag)' == ''">-O1 -Wl,-O0 -Wl,-lto-O0</EmccLinkOptimizationFlag>
+      <WasmNativeStrip>true</WasmNativeStrip>
     </PropertyGroup>
 
     <Error Text="Item WasmAssembliesToBundle is empty. This is likely an authoring error." Condition="@(WasmAssembliesToBundle->Count()) == 0" />