Don't wait on runtime confirmation when opening

Ydoc doesn't like delays so if opening a file takes a considerably more
time than usual (locking, more files to compile), ydoc will bail and
fail to initiialize properly. This is rather trivially reproducible by
adding `Thread.sleep(20*000)` to OpenFileCmd but automatic testing is
non-trivial.

engine/language-server/src/main/scala/org/enso/languageserver/text/CollaborativeBuffer.scala

@@ -179,13 +179,10 @@ class CollaborativeBuffer(
         )
       } else {
         logger.warn("Timeout reached when awaiting response from the server")
-        replyTo ! OpenFileResponse(Left(OperationTimeout))
         stop(Map.empty)
       }
     case Api.Response(Some(id), Api.OpenFileResponse) if id == requestId =>
       timeout.cancel()
-      val cap = CapabilityRegistration(CanEdit(bufferPath))
-      replyTo ! OpenFileResponse(Right(OpenFileResult(buffer, Some(cap))))
       unstashAll()
       context.become(
         collaborativeEditing(
@@ -894,6 +891,8 @@ class CollaborativeBuffer(
         self,
         ServerConfirmationTimeout
       )
+    val cap = CapabilityRegistration(CanEdit(bufferPath))
+    replyTo ! OpenFileResponse(Right(OpenFileResult(buffer, Some(cap))))
     context.become(
       waitingOnServerConfirmation(
         requestId,