[SPARK-31411][UI] Show submitted time and duration in job details page

### What changes were proposed in this pull request?

Show submitted time and duration of a job in its details page

### Why are the changes needed?

When we check job details from the SQL execution page, it will be more convenient if we can get the submission time and duration from the job page, instead of finding the info from job list page.

### Does this PR introduce any user-facing change?

Yes. After changes, the job details page shows the submitted time and duration.

### How was this patch tested?

Manual check
![image](https://user-images.githubusercontent.com/1097932/78974997-0a1de280-7ac8-11ea-8072-ce7a001b1b0c.png)

Closes apache#28179 from gengliangwang/addSubmittedTimeAndDuration.

Authored-by: Gengliang Wang <gengliang.wang@databricks.com>
Signed-off-by: Gengliang Wang <gengliang.wang@databricks.com>

Author: gengliangwang

core/src/main/scala/org/apache/spark/ui/jobs/AllJobsPage.scala

@@ -442,15 +442,10 @@ private[ui] class JobDataSource(
   }
 
   private def jobRow(jobData: v1.JobData): JobTableRowData = {
-    val duration: Option[Long] = {
-      jobData.submissionTime.map { start =>
-        val end = jobData.completionTime.map(_.getTime()).getOrElse(System.currentTimeMillis())
-        end - start.getTime()
-      }
-    }
-    val formattedDuration = duration.map(d => UIUtils.formatDuration(d)).getOrElse("Unknown")
+    val duration: Option[Long] = JobDataUtil.getDuration(jobData)
+    val formattedDuration = JobDataUtil.getFormattedDuration(jobData)
     val submissionTime = jobData.submissionTime
-    val formattedSubmissionTime = submissionTime.map(UIUtils.formatDate).getOrElse("Unknown")
+    val formattedSubmissionTime = JobDataUtil.getFormattedSubmissionTime(jobData)
     val (lastStageName, lastStageDescription) = lastStageNameAndDescription(store, jobData)
 
     val jobDescription =

core/src/main/scala/org/apache/spark/ui/jobs/JobDataUtil.scala

@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.spark.ui.jobs
+
+import org.apache.spark.status.api.v1.JobData
+import org.apache.spark.ui.UIUtils
+
+private[ui] object JobDataUtil {
+  def getDuration(jobData: JobData): Option[Long] = {
+    jobData.submissionTime.map { start =>
+        val end = jobData.completionTime.map(_.getTime()).getOrElse(System.currentTimeMillis())
+        end - start.getTime()
+    }
+  }
+
+  def getFormattedDuration(jobData: JobData): String = {
+    val duration = getDuration(jobData)
+    duration.map(d => UIUtils.formatDuration(d)).getOrElse("Unknown")
+  }
+
+  def getFormattedSubmissionTime(jobData: JobData): String = {
+    jobData.submissionTime.map(UIUtils.formatDate).getOrElse("Unknown")
+  }
+}

core/src/main/scala/org/apache/spark/ui/jobs/JobPage.scala

@@ -314,6 +314,14 @@ private[ui] class JobPage(parent: JobsTab, store: AppStatusStore) extends WebUIP
             <Strong>Status:</Strong>
             {jobData.status}
           </li>
+          <li>
+            <Strong>Submitted:</Strong>
+            {JobDataUtil.getFormattedSubmissionTime(jobData)}
+          </li>
+          <li>
+            <Strong>Duration:</Strong>
+            {JobDataUtil.getFormattedDuration(jobData)}
+          </li>
           {
             if (sqlExecutionId.isDefined) {
               <li>