[SPARK-45670][CORE] SparkSubmit does not support --total-executor-cores when deploying on K8s

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

Remove Kubernetes from the support list of `--total-executor-cores` in SparkSubmit

### Why are the changes needed?

`--total-executor-cores` does not take effect in Spark on K8s, [the
comments from original PR](#19717 (comment)) also proves that

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

The output of `spark-submit --help` changed

```patch
...
-  Spark standalone and Kubernetes only:
+  Spark standalone only:
    --total-executor-cores NUM  Total cores for all executors.
...
```
### How was this patch tested?

Pass GA and review.

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

No

Closes #43536 from pan3793/tec.

Authored-by: Cheng Pan <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: pan3793

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

@@ -674,7 +674,7 @@ private[spark] class SparkSubmit extends Logging {
         confKey = EXECUTOR_CORES.key),
       OptionAssigner(args.executorMemory, STANDALONE | YARN | KUBERNETES, ALL_DEPLOY_MODES,
         confKey = EXECUTOR_MEMORY.key),
-      OptionAssigner(args.totalExecutorCores, STANDALONE | KUBERNETES, ALL_DEPLOY_MODES,
+      OptionAssigner(args.totalExecutorCores, STANDALONE, ALL_DEPLOY_MODES,
         confKey = CORES_MAX.key),
       OptionAssigner(args.files, LOCAL | STANDALONE | KUBERNETES, ALL_DEPLOY_MODES,
         confKey = FILES.key),

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

@@ -566,7 +566,7 @@ private[deploy] class SparkSubmitArguments(args: Seq[String], env: Map[String, S
         |  --kill SUBMISSION_ID        If given, kills the driver specified.
         |  --status SUBMISSION_ID      If given, requests the status of the driver specified.
         |
-        | Spark standalone and Kubernetes only:
+        | Spark standalone only:
         |  --total-executor-cores NUM  Total cores for all executors.
         |
         | Spark standalone, YARN and Kubernetes only: