Merge pull request #38412 from heejaechang/experimentService2

fix MEF issue.

Author: JoeRobich

src/VisualStudio/CSharp/Impl/LanguageClient/CSharpLanguageServerClient.cs

@@ -31,7 +31,7 @@ internal class CSharpLanguageServerClient : AbstractLanguageServerClient
         public CSharpLanguageServerClient(
             IThreadingContext threadingContext,
             VisualStudioWorkspace workspace,
-            IEnumerable<Lazy<IOptionPersister>> lazyOptions,
+            [ImportMany]IEnumerable<Lazy<IOptionPersister>> lazyOptions,
             LanguageServerClientEventListener eventListener,
             IAsynchronousOperationListenerProvider listenerProvider)
             : base(

src/VisualStudio/VisualBasic/Impl/LanguageClient/VisualBasicLanguageServerClient.vb

@@ -27,7 +27,7 @@ Namespace Microsoft.VisualStudio.LanguageServices.VisualBasic.LanguageClient
         <Obsolete(MefConstruction.ImportingConstructorMessage, True)>
         Public Sub New(threadingContext As IThreadingContext,
                        workspace As VisualStudioWorkspace,
-                       lazyOptions As IEnumerable(Of Lazy(Of IOptionPersister)),
+                       <ImportMany> lazyOptions As IEnumerable(Of Lazy(Of IOptionPersister)),
                        eventListener As LanguageServerClientEventListener,
                        listenerProvider As IAsynchronousOperationListenerProvider)
             MyBase.New(threadingContext,