Update dubbing timing consumers

Remove the min_speed argument from TimingSynchronizer calls. Shorter speech keeps its natural speed. Use max_speed to set the preferred acceleration limit.

Remove uses of TimingAdjustment.was_truncated, truncation_seconds, and excessive_slowdown. Remove uses of TimingSummary.truncated_count, max_truncation_seconds, excessive_slowdown_count, and min_speed_factor. Regenerate saved timing summaries from the current pipeline. Use excessive_speed_count and max_speed_factor to select output for listening review.

These changes apply when updating to 0.61.2. See the current timing reference and dubbing guide for the current workflow.