exclude async on wasm

Author: VSadov

src/tests/issues.targets

@@ -3166,6 +3166,9 @@
         <ExcludeList Include="$(XunitTestBinBase)/Interop/Swift/**">
             <Issue>Not supported</Issue>
         </ExcludeList>
+        <ExcludeList Include="$(XunitTestBinBase)/async/**">
+          <Issue>Runtime async on wasm NYI</Issue>
+        </ExcludeList>
     </ItemGroup>
 
     <ItemGroup Condition="'$(TargetOS)' == 'android'" >