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452f7f67a0
Today we reroute the cluster as part of the process of starting a shard, which runs at `URGENT` priority. In large clusters, rerouting may take some time to complete, and this means that a mere trickle of shard-started events can cause starvation for other, lower-priority, tasks that are pending on the master. However, it isn't really necessary to perform a reroute when starting a shard, as long as one occurs eventually. This commit removes the inline reroute from the process of starting a shard and replaces it with a deferred one that runs at `NORMAL` priority, avoiding starvation of higher-priority tasks. Backport of #44433 and #44543.