[SPARK-3829] Make Spark logo image on the header of HistoryPage as a …

…link to HistoryPage's page #1

There is a Spark logo on the header of HistoryPage.
We can have too many HistoryPages if we run 20+ applications. So I think, it's useful if the logo is as a link to the HistoryPage's page number 1.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes apache#2690 from sarutak/SPARK-3829 and squashes the following commits:

908c109 [Kousuke Saruta] Removed extra space.
00bfbd7 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-3829
dd87480 [Kousuke Saruta] Made header Spark log image as a link to History Server's top page.

core/src/main/scala/org/apache/spark/ui/UIUtils.scala

@@ -216,8 +216,10 @@ private[spark] object UIUtils extends Logging {
           <div class="row-fluid">
             <div class="span12">
               <h3 style="vertical-align: middle; display: inline-block;">
-                <img src={prependBaseUri("/static/spark-logo-77x50px-hd.png")}
-                     style="margin-right: 15px;" />
+                <a style="text-decoration: none" href={prependBaseUri("/")}>
+                  <img src={prependBaseUri("/static/spark-logo-77x50px-hd.png")}
+                       style="margin-right: 15px;" />
+                </a>
                 {title}
               </h3>
             </div>