Enable async feature/tests

Author: VSadov

src/coreclr/inc/clrconfigvalues.h

@@ -710,7 +710,7 @@ RETAIL_CONFIG_DWORD_INFO(EXTERNAL_EnableRiscV64Zbb,             W("EnableRiscV64
 #endif
 
 // Runtime-async
-RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_RuntimeAsync, W("RuntimeAsync"), 0, "Enables runtime async method support")
+RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_RuntimeAsync, W("RuntimeAsync"), 1, "Enables runtime async method support")
 
 ///
 /// Uncategorized

src/tests/async/Directory.Build.targets

@@ -12,10 +12,5 @@
     <DisableProjectBuild Condition="'$(TestBuildMode)' == 'nativeaot' and '$(TargetArchitecture)' == 'arm64'">true</DisableProjectBuild>
   </PropertyGroup>
 
-  <PropertyGroup>
-    <!-- runtime async testing in main repo NYI -->
-    <DisableProjectBuild Condition="'$(TestBuildMode)' != 'nativeaot'">true</DisableProjectBuild>
-  </PropertyGroup>
-
   <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.targets, $(MSBuildThisFileDirectory)..))" />
 </Project>