grpc-js: Make pick_first use exitIdle #2619
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This fixes the bug described in #1490 (comment). #2609 was introduced to prevent a busy loop when pick_first is in TRANSIENT_FAILURE, and the resolver always returns the result immediately. However, making the resolver only return once caused pick_first to never update after going from READY to IDLE when a connection drops. This fixes that by making
exitIdleuse the most recent address list. This will result in some wasted work if the address list is stale, but ifexitIdleis called there should also be a resolver update pending, so it will be eventually consistent.