When vacuuming, immediately checkpoint the vacuumed row groups instead of scheduling a checkpoint task #13825
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This fixes an issue where if we are vacuuming many row groups, the system was first vacuuming everything into in-memory row groups, followed by checkpointing them later on. By directly executing the checkpoint we can checkpoint the row groups while they are still fresh in-memory, and we avoid having to keep them in-memory for an extended period of time.
This partially alleviates the need for the max_vacuum_tasks introduced in #13811 - although having a limit is likely still a good idea.