[BOLT][heatmap] Use parsed basic/branch events (#136531)
Remove duplicate profile parsing in heatmap construction, switching to
using parsed profile. #138798 adds support for using pre-aggregated
profile for heatmap construction.
Test Plan: added heatmap.test in
https://github.com/rafaelauler/bolt-tests/commit/0868850a159903ec4dd3bbacae9c8b1726b9e60e
