[BUG] Command should not execute when plan only mode is set to PHYSICAL or EXECUTION

[lsm1]

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Describe the bug

      case PhysicalMode =>
        val physical = spark.sql(statement).queryExecution.sparkPlan
        iter = new IterableFetchIterator(Seq(Row(physical.toString())))
      case ExecutionMode =>
        val executed = spark.sql(statement).queryExecution.executedPlan 
        iter = new IterableFetchIterator(Seq(Row(executed.toString())))

when kyuubi.operation.plan.only.mode is set to PHYSICAL or EXECUTION, we get plan from queryExecution, both sparkPlan and executedPlan will call assertCommandExecuted() , the Command plan such as DropTableCommand will execute

Affects Version(s)

master

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