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Fixes https://github.com/neondatabase/neon/issues/7897 ## Problem `shard->delay_us` was potentially uninitialized when we connect to PS, as it wasn't set to a non-0 value until we've first connected to the shard's pageserver. That caused the exponential backoff to use an initial value (multiplier) of 0 for the first connection attempt to that pageserver, thus causing a hot retry loop with connection attempts to the pageserver without significant delay. That in turn caused attemmpts to reconnect to quickly fail, rather than showing the expected 'wait until pageserver is available' behaviour. ## Summary of changes We initialize shard->delay_us before connection initialization if we notice it is not initialized yet.