[turbopack] mark persistent_task_type as inline (#89185)
Nearly all tasks are 'persistent' and we need to set this field as part of task execution (and read it as part of task invalidation)
By keeping it `inline` we can avoid an entry in the lazy vec which should accelerate other accesses and save memory (it would be 56 bytes in the vec, but it is 8 bytes when stored inline)
Saves quite a bit of memory
