[SPARK-49832] Make o.a.s.k8s.operator.utils.Utils argument naming consistent

[dongjoon-hyun]

Why are the changes needed?

This PR aims to make o.a.s.k8s.operator.utils.Utils argument naming consistent.

Does this PR introduce any user-facing change?

Utils has a mixed style for SparkApplication and SparkCluster argument. We had better be consistent.

• SparkApplication argument:

spark-kubernetes-operator/spark-operator/src/main/java/org/apache/spark/k8s/operator/utils/Utils.java

Line 89 in cdad512

public static Map<String, String> sparkAppResourceLabels(final SparkApplication app) {

spark-kubernetes-operator/spark-operator/src/main/java/org/apache/spark/k8s/operator/utils/Utils.java

Line 99 in cdad512

public static Map<String, String> driverLabels(final SparkApplication sparkApplication) {

• SparkCluster argument:

spark-kubernetes-operator/spark-operator/src/main/java/org/apache/spark/k8s/operator/utils/Utils.java

Line 111 in cdad512

public static Map<String, String> sparkClusterResourceLabels(final SparkCluster master) {

spark-kubernetes-operator/spark-operator/src/main/java/org/apache/spark/k8s/operator/utils/Utils.java

Line 117 in cdad512

public static Map<String, String> clusterLabels(final SparkCluster sparkCluster) {

How was this patch tested?

Pass the CIs.

Was this patch authored or co-authored using generative AI tooling?

No.

[dongjoon-hyun]

Thank you, @viirya . Merged to main.