Incremental update to the /{cloudProvider}/loadBalancers endpoint for AWS. By adding the target type to the target group key, we can fetch them all once and parse them instead of going to Redis once for each ALB and fetching the full target group details.

This is not going to be a major performance improvement on its own, I don't think: it seems like we're cutting the number of entries we get from Redis by about 33% (although that number would grow larger as ALBs supplant CLBs). The structure of the response to the call is much more complex than the comparable one to fetch all security groups - in addition to target groups, we include security group IDs associate with the load balancer for some reason, and I'm not sure who is using that data.

There are additional improvements we're considering making in Deck - mostly around not calling this endpoint unless we need to. At Netflix, over 99% of our clusters follow the established naming conventions, and use load balancers and target groups that are named after the application, so we'll have that data available when configuring a deployment cluster. We might as well just show that list and provide a link to "Show all Load Balancers" to enable the < 1% of users to pick load balancers from different applications.