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098082a8d9
In previous implementation to execute view building tasks, the
coordinator needed to firstly set their states to `STARTED`
and then it needed to remove them before it could start the next ones.
This logic required a lot of group0 commits, especially in large
clusters with higher number of nodes and big tablet count.
After previous commit to the view building worker, the coordinator
can start view building tasks without setting the `STARTED` state
and deleting finished tasks.
This patch adjusts the coordinator to save finished tasks locally,
so it can continue to execute next ones and the finished tasks are
periodically removed from the group0 by `finished_task_gc_fiber()`.
(cherry picked from commit eb04af5020)