Add log4j2 deps for spark validatesRunner tasks. (#34123)

* Add log4j2 deps for spark validatesRunner tasks.

* Trigger spark postcommit tests.

Author: shunping

.github/trigger_files/beam_PostCommit_Java_ValidatesRunner_Spark.json

@@ -4,5 +4,6 @@
   "https://github.com/apache/beam/pull/31798": "noting that PR #31798 should run this test",
   "https://github.com/apache/beam/pull/32546": "noting that PR #32546 should run this test",
   "https://github.com/apache/beam/pull/33267": "noting that PR #33267 should run this test",
-  "https://github.com/apache/beam/pull/33322": "noting that PR #33322 should run this test"
+  "https://github.com/apache/beam/pull/33322": "noting that PR #33322 should run this test",
+  "https://github.com/apache/beam/pull/34123": "noting that PR #34123 should run this test"
 }

.github/trigger_files/beam_PostCommit_Java_ValidatesRunner_SparkStructuredStreaming.json

@@ -3,5 +3,6 @@
   "https://github.com/apache/beam/pull/31156": "noting that PR #31156 should run this test",
   "https://github.com/apache/beam/pull/31798": "noting that PR #31798 should run this test",
   "https://github.com/apache/beam/pull/32546": "noting that PR #32546 should run this test",
-  "https://github.com/apache/beam/pull/33267": "noting that PR #33267 should run this test"
+  "https://github.com/apache/beam/pull/33267": "noting that PR #33267 should run this test",
+  "https://github.com/apache/beam/pull/34123": "noting that PR #34123 should run this test"
 }

runners/spark/spark_runner.gradle

@@ -216,6 +216,8 @@ dependencies {
   validatesRunner project(":sdks:java:io:hadoop-format").sourceSets.test.output
   validatesRunner project(path: ":examples:java", configuration: "testRuntimeMigration")
   validatesRunner project(path: project.path, configuration: "testRuntimeMigration")
+  validatesRunner library.java.log4j2_api
+  validatesRunner library.java.log4j2_core
   hadoopVersions.each { kv ->
     "hadoopVersion$kv.key" "org.apache.hadoop:hadoop-common:$kv.value"
     // Force paranamer 2.8 to avoid issues when using Scala 2.12