Dify lets a conversation continue after a cancelled tool call, and stops a per-row MAX(position) query storm in batch segment import

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Merged 2026-09-14 with no release cut yet: #41846 allows an agent conversation to continue after a cancelled tool call, which previously left the thread stuck; #42233 removes per-row MAX(position) queries from batch segment import, an N-query-per-row pattern on the RAG ingestion path; #42258 moves offload-object deletion outside the DB transaction; and #42205 caps QA indexing preview results. #42229 remaps assigner references when a workflow snippet is inserted, a correctness bug that would silently point a variable assignment at the wrong node.