[SPARK-32067][K8S] Use unique ConfigMap name for executor pod template

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

The pod template configmap always had the same name. This PR makes it unique.

### Why are the changes needed?

If you scheduled 2 spark jobs they will both use the same configmap name this will result in conflicts. This PR fixes that

**BEFORE**
```
$ kubectl get cm --all-namespaces -w | grep podspec
podspec-configmap                              1      65s
```

**AFTER**
```
$ kubectl get cm --all-namespaces -w | grep podspec
aaece65ef82e4a30b7b7800aad600d4f   spark-test-app-aac9f37502b2ca55-driver-podspec-conf-map   1      0s
```

This can be seen when running the integration tests

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

No

### How was this patch tested?

Unit tests and the integration tests test if this works

Closes #29934 from stijndehaes/bugfix/SPARK-32067-unique-name-for-template-configmap.

Authored-by: Stijn De Haes <stijndehaes@gmail.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>

Author: stijndehaes

resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/Constants.scala

@@ -77,7 +77,7 @@ private[spark] object Constants {
   val EXECUTOR_POD_SPEC_TEMPLATE_FILE_NAME = "pod-spec-template.yml"
   val EXECUTOR_POD_SPEC_TEMPLATE_MOUNTPATH = "/opt/spark/pod-template"
   val POD_TEMPLATE_VOLUME = "pod-template-volume"
-  val POD_TEMPLATE_CONFIGMAP = "podspec-configmap"
+  val POD_TEMPLATE_CONFIGMAP = "driver-podspec-conf-map"
   val POD_TEMPLATE_KEY = "podspec-configmap-key"
 
   // Miscellaneous

resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/PodTemplateConfigMapStep.scala

@@ -31,14 +31,16 @@ private[spark] class PodTemplateConfigMapStep(conf: KubernetesConf)
 
   private val hasTemplate = conf.contains(KUBERNETES_EXECUTOR_PODTEMPLATE_FILE)
 
+  private val configmapName = s"${conf.resourceNamePrefix}-$POD_TEMPLATE_CONFIGMAP"
+
   def configurePod(pod: SparkPod): SparkPod = {
     if (hasTemplate) {
       val podWithVolume = new PodBuilder(pod.pod)
           .editSpec()
             .addNewVolume()
               .withName(POD_TEMPLATE_VOLUME)
               .withNewConfigMap()
-                .withName(POD_TEMPLATE_CONFIGMAP)
+                .withName(configmapName)
                 .addNewItem()
                   .withKey(POD_TEMPLATE_KEY)
                   .withPath(EXECUTOR_POD_SPEC_TEMPLATE_FILE_NAME)
@@ -76,7 +78,7 @@ private[spark] class PodTemplateConfigMapStep(conf: KubernetesConf)
       val podTemplateString = Files.toString(new File(podTemplateFile), StandardCharsets.UTF_8)
       Seq(new ConfigMapBuilder()
           .withNewMetadata()
-            .withName(POD_TEMPLATE_CONFIGMAP)
+            .withName(configmapName)
           .endMetadata()
           .addToData(POD_TEMPLATE_KEY, podTemplateString)
         .build())

resource-managers/kubernetes/core/src/test/scala/org/apache/spark/deploy/k8s/features/PodTemplateConfigMapStepSuite.scala

@@ -16,13 +16,14 @@
  */
 package org.apache.spark.deploy.k8s.features
 
-import java.io.{File, PrintWriter}
+import java.io.PrintWriter
 import java.nio.file.Files
 
 import io.fabric8.kubernetes.api.model.ConfigMap
 
 import org.apache.spark.{SparkConf, SparkFunSuite}
 import org.apache.spark.deploy.k8s._
+import org.apache.spark.deploy.k8s.Constants._
 import org.apache.spark.util.Utils
 
 class PodTemplateConfigMapStepSuite extends SparkFunSuite {
@@ -56,8 +57,9 @@ class PodTemplateConfigMapStepSuite extends SparkFunSuite {
 
     assert(configuredPod.pod.getSpec.getVolumes.size() === 1)
     val volume = configuredPod.pod.getSpec.getVolumes.get(0)
+    val generatedResourceName = s"${kubernetesConf.resourceNamePrefix}-$POD_TEMPLATE_CONFIGMAP"
     assert(volume.getName === Constants.POD_TEMPLATE_VOLUME)
-    assert(volume.getConfigMap.getName === Constants.POD_TEMPLATE_CONFIGMAP)
+    assert(volume.getConfigMap.getName === generatedResourceName)
     assert(volume.getConfigMap.getItems.size() === 1)
     assert(volume.getConfigMap.getItems.get(0).getKey === Constants.POD_TEMPLATE_KEY)
     assert(volume.getConfigMap.getItems.get(0).getPath ===
@@ -70,7 +72,7 @@ class PodTemplateConfigMapStepSuite extends SparkFunSuite {
 
     val resources = step.getAdditionalKubernetesResources()
     assert(resources.size === 1)
-    assert(resources.head.getMetadata.getName === Constants.POD_TEMPLATE_CONFIGMAP)
+    assert(resources.head.getMetadata.getName === generatedResourceName)
     assert(resources.head.isInstanceOf[ConfigMap])
     val configMap = resources.head.asInstanceOf[ConfigMap]
     assert(configMap.getData.size() === 1)