[SPARK-53932] Add FAIR schedule examples with Spark (Connect|Thrift) servers

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

This PR aims to add `FAIR` schedule examples by
- Update `Spark 4.1.0-preview2`-based `Spark Connect Server` (4.1.0-preview2).
- Add `Spark 4.1.0-preview2`-based `Spark Thrift Server`

### Why are the changes needed?

To show `FAIR` schedule examples which is beneficial in the multi-tenant or concurrent job execution environments.

<img width="566" height="267" alt="Screenshot 2025-10-15 at 19 52 31" src="https://github.com/user-attachments/assets/94968cc6-cee6-483d-8d57-924a0158a2b9" />

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

No behavior change because these are examples.

### How was this patch tested?

Manual review.

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

No.

Closes #393 from dongjoon-hyun/SPARK-53932.

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

Author: dongjoon-hyun

examples/spark-connect-server-preview.yaml

@@ -25,6 +25,9 @@ spec:
     spark.dynamicAllocation.maxExecutors: "3"
     spark.kubernetes.authenticate.driver.serviceAccountName: "spark"
     spark.kubernetes.container.image: "apache/spark:{{SPARK_VERSION}}"
+    spark.kubernetes.driver.pod.excludedFeatureSteps: "org.apache.spark.deploy.k8s.features.KerberosConfDriverFeatureStep"
+    spark.kubernetes.executor.podNamePrefix: "spark-connect-server-preview"
+    spark.scheduler.mode: "FAIR"
   applicationTolerations:
     resourceRetainPolicy: OnFailure
   runtimeVersions:

examples/spark-thrift-server-preview.yaml

@@ -0,0 +1,36 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+apiVersion: spark.apache.org/v1
+kind: SparkApplication
+metadata:
+  name: spark-thrift-server-preview
+spec:
+  mainClass: "org.apache.spark.sql.hive.thriftserver.HiveThriftServer2"
+  sparkConf:
+    spark.dynamicAllocation.enabled: "true"
+    spark.dynamicAllocation.shuffleTracking.enabled: "true"
+    spark.dynamicAllocation.minExecutors: "3"
+    spark.dynamicAllocation.maxExecutors: "3"
+    spark.kubernetes.authenticate.driver.serviceAccountName: "spark"
+    spark.kubernetes.container.image: "apache/spark:{{SPARK_VERSION}}-java21-scala"
+    spark.kubernetes.driver.pod.excludedFeatureSteps: "org.apache.spark.deploy.k8s.features.KerberosConfDriverFeatureStep"
+    spark.kubernetes.executor.podNamePrefix: "spark-thrift-server-preview"
+    spark.scheduler.mode: "FAIR"
+  runtimeVersions:
+    sparkVersion: "4.1.0-preview2"
+  applicationTolerations:
+    restartConfig:
+      restartPolicy: Always
+      maxRestartAttempts: 9223372036854775807