Fix horizontal box/violin hover label misalignment under hovermode:'closest' #3401
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fixes #3050 (although it might worth moving #3050 (comment) into a new issue).
The idea behind this patch came from @nicolaskruchten 's #3396 - which revealed that something was wrong with how box/violin horizontal hover labels were sorted before the avoid-overlap algo. This PR is essentially a continuation of #3043
I have to add some tolerance in the kde hover label text assertion, but other than that this PR is ready to review cc @plotly/plotly_js