Add option for opting out of enter route snapshotting in zoom page transition

[jonahwilliams]

This may require a small breaking change to the route settings API. We could potentially CP this but I'll need to investigate first

[Time1ess]

IMHO, I wonder if it's OK to add this option to the zoom page transition builder object itself, then we may not need breaking change while enable global opt-out instead of per-page opt-out. E.g

const ZoomPageTransitionsBuilder({
  this.enableEnterPageSnapshotting = true,
});

  final bool enableEnterPageSnapshotting;

[jonahwilliams]

This was done

[github-actions]

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