Can the self._validate_params() on line 383 of sklearn/cluster/_dbscan.py now be removed? Is it doing simple parameter validation?

Talked with @glemaitre offline, this function doesn't need parameter validation because it's already happening inside the class.

@vinayak-mehta I propose reopening this PR to add a note to inform the users that no parameter validation is done.

In the "Notes" section we can add the following:

Notes
-----
Note that the input parameters will not be validated, to optimize execution time.
If you wish to validate the parameters, use the :class:`DBSCAN` instead.
It will validate the input parameters when calling the method :term:`fit`.

@glemaitre the function calls the class, which validates input, therefore it's not the case that dbscan doesn't validate inputs.

True. I am confused. We are doing both ways function calling estimator and estimator calling function. So fine do keep as-is.