[KYUUBI #7313] If the k8s application is pending, audit the status as well

### Why are the changes needed?

I saw that, a pod pending for 3 hours.
```
/var/log/hadoop/kyuubi/audit/k8s-audit.log.2026-01-23-08.gz::2026-01-23 08:09:31.356 INFO [-935552520-pool-3-thread-2861] org.apache.kyuubi.engine.KubernetesApplicationAuditLogger: eventType=UPDATE	label=cb370310-9c4c-4982-817e-85f4f6c031a9	context=kube-apiserver-a-spark	namespace=dls-prod	pod=kyuubi-hadp-adi-hadp-w-md-tbl-location-w-muso-0-ae7bd346-20260123-stm-cb370310-9c4c-4982-817e-85f4f6c031a9-driver	podState=Pending	containers=[]	appId=spark-f67cc33544654d828d36cc9553404a3e	appName=hadp-adi-hadp-w-md-t-818abc6d23397c33859c76dff9aa82e7244a92ba	appState=PENDING	appError=''
/var/log/hadoop/kyuubi/audit/k8s-audit.log.2026-01-23-11.gz::2026-01-23 11:09:50.121 INFO [-935552520-pool-3-thread-2902] org.apache.kyuubi.engine.KubernetesApplicationAuditLogger: eventType=UPDATE	label=cb370310-9c4c-4982-817e-85f4f6c031a9	context=kube-apiserver-a-spark	namespace=dls-prod	pod=kyuubi-hadp-adi-hadp-w-md-tbl-location-w-muso-0-ae7bd346-20260123-stm-cb370310-9c4c-4982-817e-85f4f6c031a9-driver	podState=Pending	containers=[]	appId=spark-f67cc33544654d828d36cc9553404a3e	appName=hadp-adi-hadp-w-md-t-818abc6d23397c33859c76dff9aa82e7244a92ba	appState=PENDING	appError=''
```

However, the audit log did not record that why the pod pending for so long time.

So, I think we should check the pod state if pod is pending.

Also, for yarn app, it would also return the app pending reason for example waiting for am allocation.
### How was this patch tested?

Code review.

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

No.

Closes #7313 from turboFei/audit_k8s_pending.

Closes #7313

1faff5e [Wang, Fei] comments
b456a84 [Wang, Fei] If the k8s application is pending, audit the status as well

Authored-by: Wang, Fei <fwang12@ebay.com>
Signed-off-by: Wang, Fei <fwang12@ebay.com>

Author: turboFei

kyuubi-server/src/main/scala/org/apache/kyuubi/engine/KubernetesApplicationOperation.scala

@@ -660,7 +660,9 @@ object KubernetesApplicationOperation extends Logging {
       case None => podAppState
     }
     val applicationError = {
-      if (ApplicationState.isFailed(applicationState, supportPersistedAppState = true)) {
+      if (ApplicationState.isFailed(
+          applicationState,
+          supportPersistedAppState = true) || applicationState == ApplicationState.PENDING) {
         val errorMap = containerStatusToBuildAppState.map { cs =>
           Map(
             "Pod" -> podName,
@@ -670,7 +672,7 @@ object KubernetesApplicationOperation extends Logging {
         }.getOrElse {
           Map("Pod" -> podName, "PodStatus" -> pod.getStatus)
         }
-        Some(JsonUtils.toPrettyJson(errorMap.asJava))
+        Some(JsonUtils.toJson(errorMap.asJava))
       } else {
         None
       }