[BOLT][NFCI] Unify branch profile handling in DataAggregator #138181
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Use traces throughout branch profile handling, unifying perf data and
pre-aggregated profile data handling. This in turn makes it possible
to use pre-aggregated data for heatmaps.
Trace is a triple of (branch source, branch target, fallthrough end),
introduced in #127125.
Test Plan: NFCI