[fix](cloud) Fix possible incorrect merged tablet stats while iterating detached tablet stats #40494
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Previous impl. of `get_detached_tablet_stats()` may miss some detached KVs or tablet stats due to KV iterating paging (`RangeGetIterator.more() == true`), which leads to zero detached stats and produce buggy data size report to FE.
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…ng detached tablet stats (#40494) Previous impl. of `get_detached_tablet_stats()` may miss some detached KVs or tablet stats due to KV iterating paging (`RangeGetIterator.more() == true`), which leads to zero detached stats and produce buggy data size report to FE.
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Previous impl. of
get_detached_tablet_stats()may miss some detached KVs or tablet stats due to KV iterating paging (RangeGetIterator.more() == true), which leads to zero detached stats and produce buggy data size report to FE.