* Fix dense y-axis labels in heatmap using tsbuckets
This change emulates the non-tsbuckets Y-axis tick count by making
the y-axis label formatter treat a dense set as a sparse set.
fixes#11342
* have d3 do the work
* Update public/app/plugins/panel/heatmap/rendering.ts
Co-authored-by: Alexander Zobnin <alexanderzobnin@gmail.com>
Co-authored-by: Alexander Zobnin <alexanderzobnin@gmail.com>
Theo SchlossnagleandAlexander Zobnin