[SPARK-36451][BUILD] Ivy skips looking for source and doc pom

### What changes were proposed in this pull request?
Because SPARK-35863 Upgrade Ivy to 2.5.0, it supports skip searching the source and doc pom, but the remote repo will still be queried at present.

### Why are the changes needed?
Can improve the speed of some UT, such as `IsolatedClientLoader#downloadVersion`, no need to find source and doc pom

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
manual UT

Closes apache#33678 from cxzl25/SPARK-36451.

Authored-by: sychen <sychen@ctrip.com>
Signed-off-by: Sean Owen <srowen@gmail.com>

core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala

@@ -1282,6 +1282,12 @@ private[spark] object SparkSubmitUtils extends Logging {
     ivySettings.addResolver(repoResolver)
     ivySettings.setDefaultResolver(repoResolver.getName)
     processRemoteRepoArg(ivySettings, remoteRepos)
+    // (since 2.5) Setting the property ivy.maven.lookup.sources to false
+    // disables the lookup of the sources artifact.
+    // And setting the property ivy.maven.lookup.javadoc to false
+    // disables the lookup of the javadoc artifact.
+    ivySettings.setVariable("ivy.maven.lookup.sources", "false")
+    ivySettings.setVariable("ivy.maven.lookup.javadoc", "false")
     ivySettings
   }