[pull] main from facebook:main #286
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This simplifies the logic for clamping the start times of various phases. Instead of checking in multiple places I ensure we compute a value for each phase that is then clamped to the next phase so they don't overlap. If they're zero they're not printed. I also added a name for all the anonymous labels. Those are mainly fillers for sync work that should be quick but it helps debugging if we can name them. Finally the real fix is to update the clamp time which previously could lead to overlapping entries for consecutive updates when a previous update never finalized before the next update.
Stacked on #34509. View Transitions introduces a bunch of new types of gaps in the commit phase which needs to be logged differently in the performance track. One thing that can happen is that a `flushSync` update forces the View Transition to abort before it has started if it happens in the gap before the transition is ready. In that case we log "Interrupted View Transition". Otherwise, when we're done in `startViewTransition` there's some work to finalize the animations before the `ready` calllback. This is logged as "Starting Animation". Then there's a gap before the passive effects fire which we log as "Animating". This can be long unless they're forced to flush early e.g. due to another lane updating. The "Animating" track should then pick up which doesn't do yet. This one is tricky because this is after the actual commit phase and needs to be interrupted by new renders which themselves can be suspended on the animation finshing. This PR is just a subset of all the cases. Will need a lot more work. <img width="679" height="161" alt="Screenshot 2025-09-16 at 10 19 06 PM" src="https://github.com/user-attachments/assets/0407372d-aaed-41f5-a262-059b2686ae87" />
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