priority: sync priority with child in use #5549
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Recently, we added functionality to push config updates to all child policies (not just the active one) and process all child picker updates before determining active priority. See: #5417
As part of this change though, we were calling
syncPrioritywith an empty child name at the end of the config processing pipeline. This sometimes could lead to the priority LB policy dropping picker updates which could lead to all RPCs getting blocked.RELEASE NOTES: