add dbcv score (unsupervised clustering score) and one test comparing kmeans and dbscan dbcv score#28036

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Nylio-prog wants to merge 7 commits intoscikit-learn:mainfrom

Nylio-prog:dbcv_score

Commits on Dec 30, 2023

add dbcv score and one test for kmeans and dbscan score
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Commits on Jan 2, 2024

moved text from changelog 1.4 to 1.5
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