[SPARK-11975] [ML] Remove duplicate mllib example (DT/RF/GBT in Java/Python) #9954
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Remove duplicate mllib example (DT/RF/GBT in Java/Python).
Since we have tutorial code for DT/RF/GBT classification/regression in Scala/Java/Python and example applications for DT/RF/GBT in Scala, so we mark these as duplicated and remove them.
@mengxr