CASSANDRA-20752 Add SSTableFlushObserver#onSSTableWriterSwitched#4380

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pranavshenoy:sstableindex_flushing

Commits on Oct 9, 2025

add SSTableFlushObserver#onSSTableWriterSwitched to flush SAI segment builder for written shards without waiting for entire transaction to complete. This reduces memory usage during sharded compact…
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