Revert "[SPARK-3454] separate json endpoints for data in the UI"

.rat-excludes

core/pom.xml

core/src/main/java/org/apache/spark/JobExecutionStatus.java

...ava/org/apache/spark/status/api/v1/ApplicationStatus.java

...main/java/org/apache/spark/status/api/v1/StageStatus.java

...main/java/org/apache/spark/status/api/v1/TaskSorting.java

core/src/main/java/org/apache/spark/util/EnumUtil.java

core/src/main/scala/org/apache/spark/SparkContext.scala

core/src/main/scala/org/apache/spark/annotation/Private.java

...che/spark/deploy/history/ApplicationHistoryProvider.scala

...a/org/apache/spark/deploy/history/FsHistoryProvider.scala

...scala/org/apache/spark/deploy/history/HistoryServer.scala

...cala/org/apache/spark/deploy/master/ApplicationInfo.scala

...rc/main/scala/org/apache/spark/deploy/master/Master.scala

...a/org/apache/spark/deploy/master/ui/ApplicationPage.scala

.../scala/org/apache/spark/deploy/master/ui/MasterPage.scala

...scala/org/apache/spark/deploy/master/ui/MasterWebUI.scala

...cala/org/apache/spark/status/api/v1/AllJobsResource.scala

...scala/org/apache/spark/status/api/v1/AllRDDResource.scala

...la/org/apache/spark/status/api/v1/AllStagesResource.scala