Remove meshlet builder retry queue #16941
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Revert the retry queue for stuck meshlet groups that couldn't simplify added in #15886.
It was a hack that didn't really work, that was intended to help solve meshlets getting stuck and never getting simplified further. The actual solution is a new DAG building algorithm that I have coming in a followup PR. With that PR, there will be no need for the retry queue, as meshlets will rarely ever get stuck (I checked, the code never gets called). I split this off into it's own PR for easier reviewing.
Meshlet IDs during building are back to being relative to the overall list of meshlets across all LODs, instead of starting at 0 for the first meshlet in the simplification queue for the current LOD, regardless of how many meshlets there are in the asset total.
Not going to bother to regenerate the bunny asset for this PR.