Move GardeningServer out of BuildSlaveSupport

Tools/GardeningServer/styles/TestFailures.css

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 99 matching lines @@
 }
 
 .expandable {
     height: 0px;
     overflow: hidden;
 }
 
 .expanded > .expandable {
     height: auto;
 }