branch-4.0: [fix](transaction) Fail fast when a backend restarts during insert #65525#65565
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…65525) ### What problem does this PR solve? Introduced by #41730 Nereids INSERT waits for fragment completion through LoadProcessor. The backend health check only considered the alive flag, so a quickly restarted backend could look healthy even though the old process could no longer report fragment completion. Capture the backend process epoch when fragment tasks are created, compare it while joining, and propagate a precise restart error through the existing coordinator cancellation path.
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Cherry-picked from #65525