Drop Kyuubi extension for Spark 3.1

docs/extensions/engines/spark/rules.md

@@ -68,7 +68,6 @@ Kyuubi provides some configs to make these feature easy to use.
 |                                Name                                 |             Default Value              |                                                                                                                                                                     Description                                                                                                                                                                      | Since |
 |---------------------------------------------------------------------|----------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------|
 | spark.sql.optimizer.insertRepartitionBeforeWrite.enabled            | true                                   | Add repartition node at the top of query plan. An approach of merging small files.                                                                                                                                                                                                                                                                   | 1.2.0 |
-| spark.sql.optimizer.insertRepartitionNum                            | none                                   | The partition number if `spark.sql.optimizer.insertRepartitionBeforeWrite.enabled` is enabled. If AQE is disabled, the default value is `spark.sql.shuffle.partitions`. If AQE is enabled, the default value is none that means depend on AQE. This config is used for Spark 3.1 only.                                                               | 1.2.0 |
 | spark.sql.optimizer.dynamicPartitionInsertionRepartitionNum         | 100                                    | The partition number of each dynamic partition if `spark.sql.optimizer.insertRepartitionBeforeWrite.enabled` is enabled. We will repartition by dynamic partition columns to reduce the small file but that can cause data skew. This config is to extend the partition of dynamic partition column to avoid skew but may generate some small files. | 1.2.0 |
 | spark.sql.optimizer.forceShuffleBeforeJoin.enabled                  | false                                  | Ensure shuffle node exists before shuffled join (shj and smj) to make AQE `OptimizeSkewedJoin` works (complex scenario join, multi table join).                                                                                                                                                                                                      | 1.2.0 |
 | spark.sql.optimizer.finalStageConfigIsolation.enabled               | false                                  | If true, the final stage support use different config with previous stage. The prefix of final stage config key should be `spark.sql.finalStage.`. For example, the raw spark config: `spark.sql.adaptive.advisoryPartitionSizeInBytes`, then the final stage config should be: `spark.sql.finalStage.adaptive.advisoryPartitionSizeInBytes`.        | 1.2.0 |