[MRG] Removes input validation radiusneighborsclassifier (#21518)
[MRG] Removes input validation radiusneighborsclassifier (#21518)



Co-authored-by: Fortune Uwha <399c4bc8f868f6a8677eb357e2f3fe4fd71b1ae7@gmail.com>
Co-authored-by:  Thomas J. Fan <5e8796a332fafc9c261437cd1787ae2709a896a7@gmail.com>
scikit-learn/scikit-learn,vinayak-mehta/scikit-learn,anntzer/scikit-learn,betatim/scikit-learn,AlexandreAbraham/scikit-learn,espg/scikit-learn,anntzer/scikit-learn,AlexandreAbraham/scikit-learn,manhhomienbienthuy/scikit-learn,saiwing-yeung/scikit-learn,jakirkham/scikit-learn,jakirkham/scikit-learn,ivannz/scikit-learn,sergeyf/scikit-learn,saiwing-yeung/scikit-learn,lesteve/scikit-learn,TomDLT/scikit-learn,anntzer/scikit-learn,scikit-learn/scikit-learn,AlexandreAbraham/scikit-learn,scikit-learn/scikit-learn,jakirkham/scikit-learn,ivannz/scikit-learn,sergeyf/scikit-learn,betatim/scikit-learn,TomDLT/scikit-learn,saiwing-yeung/scikit-learn,vinayak-mehta/scikit-learn,anntzer/scikit-learn,TomDLT/scikit-learn,espg/scikit-learn,jakirkham/scikit-learn,vinayak-mehta/scikit-learn,lesteve/scikit-learn,espg/scikit-learn,lesteve/scikit-learn,vinayak-mehta/scikit-learn,ivannz/scikit-learn,TomDLT/scikit-learn,betatim/scikit-learn,manhhomienbienthuy/scikit-learn,espg/scikit-learn,AlexandreAbraham/scikit-learn,scikit-learn/scikit-learn,saiwing-yeung/scikit-learn,sergeyf/scikit-learn,ivannz/scikit-learn,manhhomienbienthuy/scikit-learn,manhhomienbienthuy/scikit-learn,sergeyf/scikit-learn,betatim/scikit-learn,lesteve/scikit-learn