[MERGE INTO] Fix DeletionVector merging for IcebergDelete::Flush#1038
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…st with multiple merge intos to ensure that deletion vectors get properly merged
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This PR needs #1037
There are situations where
ProcessDeletesisn't called when we reachIcebergDelete::Flush, so we make sure it's called.This ensures that the
positional_deletesis populated with existing deletion vectors that target the same data file, so they can be marked as altered and eventually merged+deleted.