[SPARK-35394][K8S][BUILD] Move kubernetes-client.version to root pom …

…file

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

This PR aims to unify two K8s version variables in two `pom.xml`s into one. `kubernetes-client.version` is correct because the artifact ID is `kubernetes-client`.

```
kubernetes.client.version (kubernetes/core module)
kubernetes-client.version (kubernetes/integration-test module)
```

### Why are the changes needed?

Having two variables for the same value is confusing and inconvenient when we upgrade K8s versions.

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

No.

### How was this patch tested?

Pass the CIs. (The compilation test passes are enough.)

Closes #32531 from dongjoon-hyun/SPARK-35394.

Authored-by: Dongjoon Hyun <dhyun@apple.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>

pom.xml

@@ -204,6 +204,7 @@
     <arrow.version>2.0.0</arrow.version>
     <!-- org.fusesource.leveldbjni will be used except on arm64 platform. -->
     <leveldbjni.group>org.fusesource.leveldbjni</leveldbjni.group>
+    <kubernetes-client.version>5.3.1</kubernetes-client.version>
 
     <test.java.home>${java.home}</test.java.home>
 

resource-managers/kubernetes/core/pom.xml

@@ -29,8 +29,6 @@
   <name>Spark Project Kubernetes</name>
   <properties>
     <sbt.project.name>kubernetes</sbt.project.name>
-    <!-- Note: Please update the kubernetes client version in kubernetes/integration-tests/pom.xml -->
-    <kubernetes.client.version>5.3.1</kubernetes.client.version>
   </properties>
 
   <dependencies>
@@ -57,7 +55,7 @@
     <dependency>
       <groupId>io.fabric8</groupId>
       <artifactId>kubernetes-client</artifactId>
-      <version>${kubernetes.client.version}</version>
+      <version>${kubernetes-client.version}</version>
       <exclusions>
         <exclusion>
           <groupId>com.fasterxml.jackson.core</groupId>

resource-managers/kubernetes/integration-tests/pom.xml

@@ -28,7 +28,6 @@
   <properties>
     <download-maven-plugin.version>1.3.0</download-maven-plugin.version>
     <extraScalaTestArgs></extraScalaTestArgs>
-    <kubernetes-client.version>5.3.1</kubernetes-client.version>
     <sbt.project.name>kubernetes-integration-tests</sbt.project.name>
 
     <!-- Integration Test Configuration Properties -->