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branch-4.2: [fix](fe) Guard fragment cleanup until dispatch completes #66767 - #70328
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Production stress-test logs captured the lifecycle race for a load
query. At
13:35:52.506, BE received `FINISHED` and destroyed Query Context
`6aa1098800c457e-bad0398f81aa610f`. About 61 ms later, its phase-two
`exec_plan_fragment_start` RPC arrived and failed with `Failed to get
query fragments context`,
causing the INSERT SELECT to fail. Root cause: FE could broadcast
successful cleanup as soon as
execution completion was reported, without waiting for all fragment
dispatch RPCs to finish. This
change delays `FINISHED` cleanup until both execution and fragment
dispatch complete. It also
ensures that if the dispatch deadline has already expired after RPC
futures were submitted, FE
records the error and actively cancels the coordinator so prepared or
running backend contexts are
not left behind until backend timeout.
### Release note
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- [ ] Yes. <!-- Explain the behavior change -->
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Cherry-picked from #66767