Merge pull request #19884 from danielenricocahall:fix-prediction-features-bug

Fix bug with predictions in RTrees/Boost

* address bug where predict functions with invalid feature count in rtrees/boost models

* compact matrix rep in tests

* check 1..n-1 and n+1 in feature size validation test

modules/ml/src/rtrees.cpp

@@ -479,6 +479,7 @@ public:
     float predict( InputArray samples, OutputArray results, int flags ) const CV_OVERRIDE
     {
         CV_TRACE_FUNCTION();
+        CV_Assert( samples.cols() == getVarCount() && samples.type() == CV_32F );
         return impl.predict(samples, results, flags);
     }