[BUG] Issue with the new logger in UMAP (and possibly elsewhere)

[viclafargue]

An issue appeared during the introduction of the new logger system. The condition that guarded logging previously evaluated to false as a default and is now set to true by default (e.g example).

In the case of UMAP, this causes a crash on small inputs. PR #6332 is a temporary solution targeting imminent patch release to avoid crashing in UMAP.

This issue serves as a reminder to look into how the default values are set in the new logger to avoid logging by default.