Link dashboard title to a url version of itself

When using a stable project dashboard URL, the url
obfuscates the content of the dashboard which can make
it hard to debug a dashboard or copy and modify it.  In
the special case of stable dashboards, make the title a
link to an unstable url version of the dashboard with the
url reflecting the actual dashboard contents the way a
custom dashboard does.

Change-Id: I7916bdd8767b5f0854e4b0e1a05ff8eb3bfc3a16

gerrit-common/src/main/java/com/google/gerrit/common/PageLinks.java

@@ -69,6 +69,10 @@ public class PageLinks {
     return toChangeQuery(op("owner", fullname) + " " + status(status), TOP);
   }
 
+  public static String toCustomDashboard(final String params) {
+    return "/dashboard/?" + params;
+  }
+
   public static String toProjectDashboards(Project.NameKey proj) {
     return ADMIN_PROJECTS + proj.get() + ",dashboards";
   }