[.Net] Remove Workflow class && bump version to 0.0.14 (#2675)

* remove workflow class

* bump version to 0.0.14

Author: LittleLittleCloud

dotnet/eng/MetaInfo.props

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
     <PropertyGroup>
-        <VersionPrefix>0.0.13</VersionPrefix>
+        <VersionPrefix>0.0.14</VersionPrefix>
         <Authors>AutoGen</Authors>
         <PackageProjectUrl>https://microsoft.github.io/autogen-for-net/</PackageProjectUrl>
         <RepositoryUrl>https://github.com/microsoft/autogen</RepositoryUrl>

dotnet/src/AutoGen.Core/GroupChat/Graph.cs

@@ -8,19 +8,6 @@
 
 namespace AutoGen.Core;
 
-/// <summary>
-/// Obsolete: please use <see cref="Graph"/>
-/// </summary>
-[Obsolete("please use Graph")]
-public class Workflow : Graph
-{
-    [Obsolete("please use Graph")]
-    public Workflow(IEnumerable<Transition> transitions)
-        : base(transitions)
-    {
-    }
-}
-
 public class Graph
 {
     private readonly List<Transition> transitions = new List<Transition>();