prune the heap more #14
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Exercise the existing heapam page pruning code on the INSERT paths to more pro-actively re-order heap pages and potentially free up space.
heap_page_prune_opt() doesn't take into account the size of the tuple that's trying to be inserted, it only checks if the page has less free space than the minimum threshold, but doesn't consider whether pruning could make enough space for a specific tuple. Consider pruning if the current free space plus potential space from pruning could accommodate the tuple, even if the page doesn't meet the normal threshold.
Add scan-time heap page pruning functionality and a mechanism to track page modifications during scans and re-evaluate pruning eligibility. This addresses the issue where multiple updates during a scan don't trigger heap page pruning until the next scan.
Set PageSetPrunable during heap_insert() and heap_multi_insert() to enable opportunistic cleanup of dead tuples from aborted transactions. Previously, aborted insert tuples would remain until the next vacuum cycle if no other modifications occurred on the page.
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