provider/aws: Fix issue with updating ELB subnets for subnets in the same AZ #9131
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Fixes #9120 by swapping the order in which we update the subnets on an ELB. Prior to this, we added then removed; here we remove then add, which is more consistent with our other resources.
We also add inside of a retry loop, to guard against any eventual consistency issues where AWS may think the previous AZ has not been removed yet