Skip shim and handler tests when running build.cmd -test in IIS subfolder (#26202)

Author: jkotalik

src/Servers/IIS/build.cmd

@@ -1,3 +1,3 @@
 @ECHO OFF
 SET RepoRoot=%~dp0..\..\..
-%RepoRoot%\build.cmd -projects %~dp0**\*.csproj %*
+%RepoRoot%\build.cmd -projects %~dp0**\*.csproj /p:SkipIISNewHandlerTests=true /p:SkipIISNewShimTests=true %*