Add more timing information into reconciliation log

[andrii-korotkov-verkada]

Summary

There's a log "Reconciliation completed" that includes some timing information, like git_ms and patch_ms. However, quite often the total time time_ms is several times larger than a sum of existing breakdowns, indicating that some slow steps are not being timed. It would be great to have a more detailed breakdown.

Motivation

Have a more detailed breakdown of time spent on reconciliation.

Proposal

Add more timing tracking, perhaps using TimingStats and its addCheckpoint.