[GORDO-1552] Implement conductor canceled state #18423
Merged
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Adds cancel state that cleans up worker and spawn actors (meaning they are set to finished, such that garbage collection can delete them).
I changed all other final states (Done, FatalError and AQLResultsAvailable) do the same cleanup.
When the cleanup is finished in all these states, the conductor changes its execution state to Finished state, which cleans up the conductor.