core/rawdb: only complain loudly if truncating many items #21483
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When we originally implemented the freezer, it was disallowed to roll back items from it. In theory Geth will never do it itself during normal mode of operation, but in practice the user can call SetHead and Geth can roll back during fast sync. With the unified rollback handling, all these paths use the same code that printed the warning. This resulted in 2000 truncation warnings printed every time fast sync failed (2K headers rolled back).
This PR changes the behavior so that if only a single item is removed (SetHead will remove one-by-one since it needs to do additional maintenance after each), the log level is Debug, not Warn. If the freezer gets corrupted and a lot of data is removed we will still see the large truncation warnings.