Fix race conditions when initializing and rendering IPyWidgets #5462
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When rendering IPyWidgets in a notebook there was a race condition which meant that because lazy_initialize was slow you could end up with multiple Views for the same model.
@mattpap While I realize I was inappropriately using lazy_initialize here I think this revealed a bokeh bug where there could be a race condition where
this._child_views
was reset while a view was still initializing meaning that it was never cleaned up (or reused).Fixes #5459